A New Family of High-Temperature Superconductors

sciencehabit writes to let us know that physicists are hailing the discovery of a new type of superconductor as a "major advance." The new materials could solve the biggest mystery in condensed matter physics — i.e., how and why cuprate superconductors work — as well as paving the way for practical magnetic levitation and lossless transmission of energy. "God only knows where it will go," says one Nobel Laureate. After the discovery of superconductivity in an iron-and-arsenic compound at 26 kelvin, several Chinese research groups quickly found related materials that are superconducting up to 55K. (Cuprates go as high as 138K; liquid nitrogen boils at 77K.)

Higgs?

[sm62704]

"God only knows where it will go," says one Nobel Laureate.

They found the Higgs boson? [wikipedia.org]

Re:

[philspear]

I know where it will go: really efficient wires. For electricity. Also maybe like a hoverskateboard. Am I God?

Re:

[Ceriel Nosforit]

It's a misquote BTW, taking the whole thing out of context. The full quote is:

"If it's really a new mechanism, God knows where it will go," he says.

One must at the very least indicate that it is a partial quote, like so:

"...God knows where it will go."

The "..." indicates that the first part has been cut off.

Re:

[DarkKnightRadick]

Actually, it's not required to be considered a proper quote. Yeah, it can be abused to take things out of context, but RTFA.

Re:

[sm62704]

It was a joke, and it must really have sucked because nobody seemed to have gotten it. Higgs="god particle"

Tough room

Re:

[sm62704]

To the mods "WOOSH!

To quote Foghorn Leghorn, "It's a joke, son. Don't ya get it?"

How can you not get that simple joke and call yourselves nerds? Jesus, folks, itt isn't rocket science. It isn't even subatomic particle physics!

The Higgs bosun is called "the god particle". I even linked the fucking Wikipedia article in case there were morons with mod points.

Hot!

[gmuslera]

"High-Temperature Superconductors", the article say somewhere that "ignited a firestorm of research", and all of that because the temp at which are superconductors is 55 not celcius, not farenheit, but kelvin.

I know that from very few over 0k to 55k there is a big difference, not sure how high they can reach, but still, looks a bit too low for "practical" implementation yet.

Re:Hot!

[Ctrl-Z]

The "firestorm" was ignited by the discovery of cuprate semiconductors, which "have critical temperatures in excess of 90 kelvin"[1], which is above the temperature of liquid nitrogen.

[1]http://en.wikipedia.org/wiki/Superconductor [wikipedia.org]

Re:Hot!

[explosivejared]

The article specifically mentions 138 kelvins as the highest temperature where cuprates still hold on to superconductivity. That's roughly -115 degrees celsius. This greatly increases the viability of the material by greatly reducing the energy required to hold it at a critical temperature. Think about the wide extent to which liquid nitrogen is used.

Currently we are in the stage of trying to understand just what exactly is going on at the particle level. Once we move past this research stage (disclaimer: it's been going on for twenty years), the possibilities these materials provide are pretty much endless.

Re:Hot!

[DieByWire]

The article specifically mentions 138 kelvins as the highest temperature where cuprates still hold on to superconductivity. That's roughly -115 degrees celsius.

I believe you mean -135 degrees celsius.

That last twenty degrees is what keeps Minnesota from superconducting in winter.

Re:

[Rei]

The big deal with this discovery isn't that the possibilities the new materials they've found are endless. They actually underperform what we already have. It's that we don't understand how what we have (cuprate superconductors) works, but if we did, we could potentially find much higher-temperature superconductors. This gives us a key to help understand high temperature superconductivity. And the possibilities of high-temperature superconductors would be endless (assuming they could be made affordably).

Re:

[Joe Snipe]

For a less technical view of how cool this is:

www.youtube.com/watch?v=-RJwqkWawcU

Re:Hot!

[jellomizer]

Well there is a huge difference in the price for using Liquid Nitrogin vs. Liquid Helium. Right now for superconductors used in MRI's they use Liquid Helium at 4k. And they use Liquid Nitrogin as an insolator to protect caseing from cracking. At roughly $1000.00 per leter of Liquid He, Liquid Nitrogin is much cheaper. Anf if they can get to a point where you can maintain superconductivity at Dry Ice level it would cause far more advances in society.

Re:

[David Gerard]

All these new materials are ridiculously brittle and difficult to form ceramics, so making coils and so forth is a major PITA and helium actually works out cheaper in practice.

Re:

[Agripa]

There are superconductors that work above the boiling point of nitrogen though right? Why not use those instead? Do the cost/problems offset the saving in coolant?

My understanding is that their lack of malleability as well as their very low critical current density prevents large scale use.

http://en.wikipedia.org/wiki/YBCO [wikipedia.org]

Re:Hot!

[evanbd]

Where do you get $1k/L? A quick google search turns up $3-5 per liter, which is about what I recalled. LN2, of course, is much cheaper -- $0.25 in small quantities, $0.05 per liter or less in very large quantities.

Dry ice is more expensive than LN2, because you have to pay for the CO2, rather than just liquefying air. But if you don't actually need dry ice, then dry ice temps are certainly cheaper to reach than LN2 temps.

Re:Hot!

[nmos]

Where do you get $1k/L? A quick google search turns up $3-5 per liter

Well duh! He's talking about MEDICAL liquid HE which is obviously much more expensive than normal liquid HE. Ever get a bandaid put on at a hospital?

Re:

[hardburn]

Does medical liquid HE work like audiophile wooden volume knobs?

Re:Hot!

[krlynch]

At roughly $1000.00 per leter of Liquid He, Liquid Nitrogin is much cheaper.

You've got the right idea, but your numbers are a bit out of whack ... LN2 is about $0.10/L in large quantity, while LHe is about $3-20/L, with large variation in price around the world (due to constrained supply and large transportation and energy costs). US He is relatively cheap, as we have a few of the small number of high quality sources. In Europe, He is very much more expensive, as they don't have any local, high quality sources. A recent compilation of costs is available here: http://hypertextbook.com/facts/2007/NadyaDillon.shtml [hypertextbook.com]

Helium is so expensive, because it is very entery intensive to liquify, and it isn't commercially extracted from the atmosphere like nitrogen ... there just isn't enough of it to be commercially viable. Instead, it is generally found in pockets underground and "mined". The helium originates as alpha particles in the decay of radioisotopes (mostly Uranium and Thorium), and permeates through the crust. It gets trapped in high pressure gas pockets by impermeable rocks, in the same types of geology that trap natural gas, and is extracted for commercial scale from those pockets. There are only a few global sources where the concentrations of helium are high enough to extract economically.

Liquid Neon as a refrigerant

[billstewart]

Most gasses have boiling points higher than nitrogen's, but there's at least one option between cheap liquid nitrogen and expensive liquid helium, which is liquid Neon [wikipedia.org], which boils at 24.5 kelvin. The Wikipedia article says it's not cheap, but not as expensive as liquid helium, has better refrigeration properties, and is extracted from air rather than rare sources that risk exhaustion.

liquid nitrogen 77K is the goal

[spineboy]

A big goal is to get superconductors to work at 77K, because then they can be cooled by cheap liquid nitrogen. Lower than that, you have to use liquid helium(I think) which is quite expensive.

Re:

[Ken_g6]

Technically, a superconductor that works at over 20.28 K can be cooled by liquid hydrogen.

One problem, of course, is that liquid hydrogen is rocket fuel!

Re:Hot!

[ThreeGigs]

The excitement isn't about superconductivity at 55K by itself. It's got everyone excited because, *finally*, there's something besides cuprates that superconducts above about 33K (which defines high temperature in the superconductor world).

Now, instead of having just one 'family' of HTSC materials to base hypotheses and theories upon, scientists now have TWO. Now they can compare similarities and differences between those two families. This gives them a HUGE boost towards figuring out the exact mechanism involved, plus potential leads on new materials that exhibit similar atomic structure which could also superconduct.

Very Hot!

[l2718]

1. "High T_c" is a technical term. Indeed, 55 kelvin is "high" (though not as high as the record for cuprates). You have to compare it with the typical T_c for metals (a few kelvin). The difference is between liquid helium temperatures and liquid nitrogen temperatures (which cuprates have reached already and perhaps the new compounds also will).

2. More improtantly, this will ignite a "firestorm of research". You see, we don't have a good model of high T_c superconductivity (unlike the BCS [wikipedia.org] model for metals). Having several different superconducting systems will help theorists isolate the significant features of the system from the less significant ones.

3. Seeing superconductivity in a totally new material is exciting. This is interesting basic research even if today we dont' have a practical application. If we don't do the research we'll never get to the practical stage.

Re:

[Matt Edd]

Very informative and coherent post. I am personally in the middle of the "firestorm of research" myself. I am a graduate student and have personally made a 52K superconductor. My professor has the entire group (about 10 people) working on this and I am about to post a preprint article on the data taken so far. This is a very exciting time to be a graduate student. It has been 12-14 hour days for me and a few others for the past few weeks. Not since the discovery of MgB2 in early 2001 has the field bee

There's already practical implementations...

[Firethorn]

I know of at least 5 superconductor power lines installed in the USA.

The important point was getting over 77k, where the relatively cheap liquid nitrogen can be used instead of other things like liquid helium.

Re:

[Anonymous Coward]

Of course, at 77k, you could run the lines through Soviet Russia... in the summertime! aaa ha ha ha. /isr temperature jokes

Re:

[Smidge204]

I recall something in the news about a HTS cable being installed in Albany, NY in... 2006? IIRC it wasn't especially impressive - a single cable that shunted power between substations several blocks away.

I'm not aware of any others and would also love to hear about them.
=Smidge=

Re:

[Firethorn]

There's 3 in Chicago that replaced either 7 or 11 oil cooled copper lines. The power company actually made money on that while increasing capacity I hear. They pulled out and sold the copper to cover the cost of the conductors. The LN cost is covered by reduced heat losses and the elimination of the need to pump & cool the oil.

Re:

[bperkins]

looks a bit too low for "practical" implementation yet.

At this point people are more interested in the physics rather than the practical applications.

This discovery is pretty important, because as TFA says, the exact mechanism that allows high temperature superconductivity to occur isn't widely agreed upon. Another system to study makes it much more likely that theorists will agree on exactly how this works.

Re:US science is dying?

[peragrin]

If you think China is a poor third world country then you are going to be shocked.
China is mostly a second world country, isn't very poor(the USA is spending trillions there), currently is almost able to duplicate just about every technologically advanced device being built.

there was a chinese company called NEC which duplicated the Real NEC's tv's poorly but close enough to work for several years before they got caught.

While it will be another 5-10 years China is rapidly building up technology, science, and math. They have the manpower power and will, just like japan had 30 years ago. Remember 40 years ago the Japanese only made junk, 20 years later they owned the electronics market, and 10 years after that had some of the best selling cars out there.

Re:

[Digi-John]

there was a chinese company called NEC which duplicated the Real NEC's tv's poorly but close enough to work for several years before they got caught.

Not only did they make the TVs, but apparently they also dealt with real NEC plants on a regular basis, and due to poor organization, nobody caught on.

Re:

[Anpheus]

If I recall, they didn't just go so far as to imitate NEC, but even had their own infrastructure set up, and their own R&D set up to allow them to offer devices that the real NEC never did.

Re:US science is dying?

[Anonymous Coward]

If you think China is a poor third world country then you are going to be shocked.
China is mostly a second world country

"First world", "second world", and "third world" are not some ranking of affluence. "X world country" was an old Cold War term. First world nations were those aligned with the West. Second world nations were those aligned with the Soviets. Third world nations were those aligned with neither. Since the fall of the USSR, there is no longer such thing as a second world country.

Third world countries tended to be poor and underdeveloped. Now "third world" has become synonymous with "poor", but it is really a misnomer.

Re:

[smoker2]

No, actually third world is the only correct usage of the group. The other 2 are Old World (Eurasia) and New World (The Americas).
Third world is so named because it is neither of the other two.

Re:

[thewiltog]

I thought the origin of Third World was much earlier. Old World = Europe/Middle East. New World = Americas/Australasia. Third World = The Rest.

Re:

[Sri.Theo]

Nope, it's pretty much known as dating to the Cold War. India, China ect were all part of the old world i.e. known about before the America's, extensive trade in spices and textiles took place between the two regions.

Re:

[Hucko]

Australia is a third world country??? eep!

Re:

[thewiltog]

Actually, 2nd world or new world

Re:US science is dying?

[What Would NPH Do]

I am more interested as to why American scientists weren't the first in on this,

Because despite the jingoist tune, the US hasn't been the forefront of technology and science for quite some time. When you have creationists trying to ruin science education all across the country it's not that surprising.

and why such cutting-edge research is being done in China (a poor third-world country).

China is poor? Since when? They're raking in the dough which is why they also hold 1/3 of the US national debt. Besides, countries in Southeast Asia have been pumping out cutting edge research for years now. If you were to shed the chauvinism for a few hours you might have noticed this already.

Re:

[megaditto]

Sure has. US is number one, see here: [nsf.gov]

The United States has the largest share of all internationally authored papers of any single country, and its researchers collaborate with counterparts in more countries than do the researchers of any other country.
U.S.-based authors were represented in 44% of all internationally coauthored articles in 2003 and collaborated with authors in 172 of the 192 countries that had any internationally coauthored articles in 2003.

And here: [in-cites.com]
US ranked #1 at 3 times the number of pape

Re:

[What Would NPH Do]

Guess that anwers my previous question: at 25% of World's population China was bound to discover something of use sooner or later...

If you think China hasn't been doing major advances in science and engineering then you're either blinded by your jingoism or you don't actually read much in the way of science/technical journals.

Re:

[MrNaz]

In the immortal words of Homer Simpson: A little from column A, and a little from column B.

Re:

[What Would NPH Do]

How about a break down of how much of that US research is by foreign scientists brought into the US. I'd be willing to bet you'll find it's a significant number. The very fact is that its' been reported all around that scientists and engineers are having to be imported in from other countries because the number of well educated "native" scientists/engineers has been declining.

Re:

[hardburn]

That's always been true, though. America's public school system has always done poorly in world ranking, but its university system is far better and attracts a lot of foreign talent.

In the past, most of that foreign talent tended to stay in the US (like Einstein or Tesla), but that might be changing.

Re:US science is dying?

[timeOday]

Let me first say, the idea of US science "dying" is just silly. And yes, for the moment we are leading.

Hanging on to our lead, on the other hand, is doubtful [scidev.net]: "Cited papers first-authored by Chinese scientists -- an important indicator of scientific creativity -- increased by 25.3 per cent in 2006, and the number of times they were cited increased 28.3 per cent. However, China remains thirteenth in terms of total citation numbers." At that rate, China won't be in 13th for long.

From the global perspective it doesn't matter; all this means mankind as a whole is simply progressing much faster now. But from the US nationalist perspective, this definitely decreases our ability to compete for increasingly scarce natural resources. We've already seen this occur drastically in the price of oil.

Re:

[philspear]

Because despite the jingoist tune, the US hasn't been the forefront of technology and science for quite some time. When you have creationists trying to ruin science education all across the country it's not that surprising.

How are creationists ruining superconducting research? (I'm not defending them, I'm looking for more ammo.)

And so as to defend myself, in some fields, like biomedical research, I think the US is still putting out the most and the highest-impact research papers.

Re:

[What Would NPH Do]

How are creationists ruining superconducting research? (I'm not defending them, I'm looking for more ammo.)

I was talking about science education in general, not this particular area.

And so as to defend myself, in some fields, like biomedical research, I think the US is still putting out the most and the highest-impact research papers.

Sure, by an increasing number of foreign scientists.

Re:

[megaditto]

Foreign-born scientists. There's a big difference here since it doesn't actually matter where they were born so long as they work for us now.

Re:

[What Would NPH Do]

Yes, that is what I meant. But actually it does matter. The very fact that more and more of the US research is being done by foreign-born scientists somewhat mutes the "FUCK YEAH AMERICA!" jingoism when it comes to proclaiming the US as being the center of science/technology research. If another country like China starts nabbing these people up more and more, the US today is going to be less and less in a position to lead with only it's native-born scientists/engineers.

Re:

[Slime-dogg]

When you have creationists trying to ruin science education all across the country it's not that surprising.

This is a red herring.

I would chalk the lack of advancement up to the lack of need for it. We can point and say, "well, we do need this," but there is no sense of urgency to that need.

Performance happens when pressure is applied. Some societies have instilled within themselves a constant pressure, and apparently progress at a faster rate than others. I imagine that the lack of urgency and impending need is what negates motivation. It doesn't seem like this applies only to scientific research, eith

Re:

[Anonymous Coward]

The main reason this research is being done in China is the fact that one has to work with Arsenic compounds. The US has more regulations regarding strongly poisonous elements.

Re:

[Guppy]

From Nature News:

Interest was rekindled two years ago when researchers at the Tokyo Institute of Technology synthesized a new superconductor based on iron rather than copper. The material also featured oxygen, lanthanum and phosphorus, but its transition temperature was just 4 degrees above absolute zero, no better than the very first superconductor discovered a century before.

Then this February, the same group announced an exciting development. The researchers had replaced phosphorus with another pnicogen, arsenic, in the layered material and - boom - the transition temperature shot up to 26 K (Y. Kamihara et al. J. Am. Chem. Soc. 130, 3296â"3297; 2008). Subsequent tweaking has already boosted that temperature above 50 K. âoeWe all were surprised,â says materials scientist Hideo Hosono, who led the study.

It would seem that this research is coming out of Japan, not China.

Re:

[somersault]

Yeah, how are we going to 'fend for ourselves' without superconductors? :O

Background Information

[explosivejared]

Here (PDF warning) [uni-augsburg.de] is an in depth look at high temperature superconductors, especially the cuprate families, for those not well versed in the subject.

Re:

[Artuir]

This is assuming standard pressure, of course. Any advancement in the operating temperature of a superconductor would make it easier to pressurize a system in order to bring its operating temperature up.

Re:

[What Would NPH Do]

"High Temperature"? I wouldn't call 55K a very warm temp at all.

With relation to superconductors it would be. They aren't saying this would be a high temperature as a climate for humans.

Re:

[Molochi]

I've always been under the impression that a major reason for superconductor research was to raise the operating temperature to a point where parity (or better) was reached between maintaining a magnetic bottle and the energy gained by a contained hydrogen fusion reaction. I'm guessing that the lack of posts stating "Mr Fusion to be trial-ed this fall" means that liquid nitrogen is too energy-expensive to make this a reality.

Hope it fits in a bedroom

[4D6963]

as well as paving the way for practical magnetic levitation

Awesome! Can't wait for my superconductor magnetic levitation bed!

Re:

[Vectronic]

"...in an iron-and-arsenic compound..."

You might not wake up from that bed...lol

Re:

[evanbd]

You can levitate frogs and such by themselves, without having to support them on a levitating magnet -- see the Youtube video [youtube.com]. Of course, that technique doesn't work with superconductors -- the field strength required is higher than they can sustain. Instead, you need a 6 megawatt electromagnet [hfml.ru.nl].

I suppose 6 MW to levitate a frog is about as impractical as it gets...

Re:

[compro01]

i wonder, how does the magnetic field needed scale with the mass to be levitated?

Re:

[hardburn]

It beats 1.21 jiggawatts to levitate a squirrel [xkcd.com].

Is this really news?

[NotBornYesterday]

Didn't we just see a far warmer superconductor just a little while ago? [slashdot.org]

Not to mention this one [slashdot.org] operating at 200 kelvin.

I feel kind of bad for these guys doing their research and coming in 150 kelvin behind everyone else.

Re:Is this really news?

[Andy Dodd]

It is news not because of any new temperature records, but because of the fact that these are the first superconductors outside of the cuprate family to exhibit high critical temperatures.

This is an entirely new family from the cuprates. The cuprates started much lower too. Also, even if this family never compares to the cuprates in performance, the behavior of this new family could shed light on the (relatively unknown) mechanisms of cuprate superconductivity, allowing for that family to be developed further.

Re:

[NotBornYesterday]

First outside the cuprate family? Maybe according to TFA, but what about the recently discussed silicon-hydrogen [slashdot.org] compounds and aluminum (or aluminium, if you prefer) nanoclusters [slashdot.org] which are a) outside the cuprate family, and b) showing superconductivity at elevated temperatures?

Re:

[What Would NPH Do]

Did you even bother to even read the summary? The discovery isn't because they are surpassing some sort of high temperature for superconductors. It's because they've discovered NEW compounds that can be used as superconductors which can help scientists in improving the theoretical models behind how superconducting works.

Re:

[NotBornYesterday]

I read the summary and TFA, and still wasn't impressed. Sure, the new iron/arsenic compounds are somewhat interesting, and maybe in the future holds some kind of potential. It just seems a little underwhelming, since other research is producing compunds that seem more promising.

Levitation

[HTH NE1]

as well as paving the way for practical magnetic levitation

Just let me know when I don't need to have my feet frozen to my hoverboard to make it work.

Re:

[HTH NE1]

Just remember, they don't work on water. Everyone knows that.

Unless you've got power, or a tow.

John

[jab9990]

And we all know that communists never lie.

Re:

[the_humeister]

And we know democracies never lie either. What's your point?

Re:

[What Would NPH Do]

Since you seem to be too lazy to even read teh summary I'll quote the relevant section for you:

are hailing the discovery of a new type of superconductor as a "major advance." The new materials could solve the biggest mystery in condensed matter physics -- i.e., how and why cuprate superconductors work

Re:

[Smidge204]

Because that was nanoparticles (~40 atoms each), not a solid material. Even if the electrical resistance within the particle was perfect, the resistance from one particle to the next could not be guaranteed.

Last month some team in Germany discovered a "room temperature" superconductor. That's still not terribly useful, though, unless you can build a wire that is safely under almost 4000 atmospheres of pressure required to turn the Silane gas into a solid.
=Smidge=

Re:

[Rei]

Because that was nanoparticles (~40 atoms each), not a solid material. Even if the electrical resistance within the particle was perfect, the resistance from one particle to the next could not be guaranteed.

Familiar with the Josephson effect [wikipedia.org]?

I sense some new pick-up lines on the horizon...

[Last_Available_Usern]

Damn girl, you look hot enough to transmit energy in a lossless....hey, where are you going?

Re:I sense some new pick-up lines on the horizon..

[HornWumpus]

Damn woman, you are hot enough to cause a critical breakdown in the finest superconductor...hey, where are you going?

Superconducting Supercomputers?

[Doc Ruby]

Are these "not so low" temperature superconductors usable to make semiconductors for computers? Can such a superconducting computer be run at extremely high clock rates, or just extremely low circuit latency, to make really fast computers not limited by the heat inefficiencies of today's regular computer chemistry?

If so, how about building these computers buried in Antarctic ice? Winter air temperature drops to -80C; deep in the ice it's probably even lower. 138K is -211C. So the energy required to cool the

Re:

[timeOday]

I am waiting with interest for an informed response to your question. But my guess is that a superconductor is only half of a supersemiconductor, which is the name I just made up for something that's instantly switchable from 0 to infinite resistance. And since infinite resistance is impossible, I would guess there will still be some current leaking through any real semiconductor, and thus waste heat. Besides the direct loss of this heat, it would make it harder to keep the superconducting parts cold en

Re:

[Doc Ruby]

While we both wait for someone informed to explain how we can or cannot currently fashion superconducting materials into transistors, we can speculated from an informed theoretical perspective :).

The answer to the problem you pose (other than how the device's physical chemistry actually makes a supersemiconductor) is just to cool the part that much lower than its superconducting point. The energy is still lost to the extra heat from imperfect resistance, and multiplied by the energy consumed in recooling th

Re:

[Jerf]

The problem is what to do with the heat pumped out, which could damage the arctic nearby, maybe even melt the foundation. But if the total mass cooled is small (like a few dozen microchips), that byproduct heat could be used to keep some human operators alive.

Scale, scale, scale, scale, scale. Don't let environmentalist mottos fool you; humans aren't actually "heating" the planet. By pumping large amounts of a greenhouse gas into the atmosphere, we are causing the planet to retain more heat. (This isn't new

Re:

[FailedTheTuringTest]

The poster was talking about local heating effects, not global, and while you're right that a few computers won't create a heat island and change the local ecology, there is one sort of local effect that is quite real and well-known all across the Arctic. Any warm structure will heat the ground it is built on slightly, and in the high Arctic where permafrost [wikipedia.org] exists, anything you build (including all buildings and pipelines) has to take this into account or the permafrost melts and the structure sinks. The

Re:

[Doc Ruby]

As the other reply to your message [slashdot.org] said, I'm not talking about upsetting the ecosystem in the arctic. I'm talking about melting the ice supporting the delicate machinery.

FWIW, the "environmentalist mottoes" are just fine. We are heating the planet, by stopping its natural cooling radiation with our thickened Greenhouse atmosphere. The same way I "warm up" by putting on a coat, even if the coat isn't that warm to start with. In fact we can directly heat the planet, and of course we do, though the effects of

Re:

[ispeters]

I don't really have a lot to say, but you made one error. Zero degrees C is 273K, so 138K is actually -135 degrees C, not -211.

Ian

Re:

[Doc Ruby]

You're right, 138K == -135C [google.com], thanks.

Which means that the ice, even if it's only -80C, is only 55C hotter than the -135C superconducting point. Unlike the usual labs, which at about 24C (I doublechecked [google.com] ;) are 159C hotter. An even better case for arctic super(conducting computers).

Double Standard Standard

[DynaSoar]

> physicists are hailing the discovery of a new
> type of superconductor...
> as well as paving the way for practical magnetic
> levitation and lossless transmission of energy.

Lossless transmission = 0 entropy

0 entropy (Isolated system? Transmission line, check. Not in equilibrium? Voltage gradient, check) = violation of the second law of thermodynamics: "The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium."

When others mak

Re:

[nmos]

In fairness most proposals for perpetual motion machines (actually all that I've seen) actually claim decreasing entropy, not just zero change. IANAP but I do wonder if superconductivity will turn out not to be completely lossless but just very very nearly lossless. Of course, in practice we're not talking about closed systems anyway.

Re:

[exploder]

Are you sure there is a voltage gradient across a superconducting transmission line?

Re:

[Planx_Constant]

If you have a transmission line, you have an input and an output, and so you do not have an isolated system. There is not a voltage gradient within a superconducting transmission line (simplistically, V = IR = 0, since R=0), even if you have one at terminals on either end. In fact, measure the voltage at points on a copper wire in a circuit, and you can see that the voltage gradient within the wire is (practically) zero. You can have an apparent violation of entropy pretty easily, if you define your "isol

Wrong Icon

[fetusbear]

Has anyone noticed the disconnect between this topic (superconducting) and the icon (supercomputing) Slashdot is using to summarize this topic? I know they both have the word "super"... and a "c". But the similarities end there.

Supercomputing is all about massively parallel computation, not just computers... nor chips. This article is about condensed matter physics and (who knows?) a possible replacement for the semiconductor.

Got a semiconductor icon, perhaps?

Your Idea/My Idea

[Nom du Keyboard]

Your idea of what constitutes "high temperature" and my idea of what constitutes "high temperature" are radically different. Until it runs in my house wiring it really isn't going to impact me any time soon.

Interesting term "firestorm" to describe the interest in this discovery. One is left thinking that the intense firestorm has resulted in pushing temperatures so high that all the superconducting stopped right there.

Distributed computing

[BigBadBus]

It is a shame that more theoretical progress hasn't been made on high Tc superconductors. This would be a project ripe for distributed computing.

Be More Specific...

[Fysiks Wurks]

"Several Chinese research groups quickly found related materials...."

Were those Chinese researh groups at US univeristies or actually in China?