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LK-99: Team of Southeast University observed zero resistance below 110 K

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Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#181

Post by ivalm »

spandrew wrote: post #157
modeless wrote: post #121

To me this is encouraging. 110K is really high! It's higher than YBCO which is what they make commercial "high temperature" superconducting tape out of. IMO if this is legit (I have no way of judging the source) then this is the first good third party evidence that the original researchers are not just doing some kind of fraud. A total fraud wouldn't have actually discovered a novel high-temperature, but not room tem…

The initial claim was speculated to be room temp and ambient pressure superconduction. 110K is a far cry from that.

It’s easy to make a high tc superconductor have lower tc through poor production quality. It may very well be that a poor sample is 110K while a high quality sample is >400K.

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#182

Post by ceejayoz »

hadlock wrote: post #152
ceejayoz wrote: post #117

Earlier quoted context omitted.

Probably depends on the power company. The ones with a lot of coal plans would suffer; the ones with a bunch of solar/wind farms in prime locations that can dramatically expand capacity (think things like giant solar farms in the Australian outback) would benefit.

HVDC and HVAC transmission lines already only see single digit transmission losses over hundreds of miles This has bigger implications in reducing wiring (and weight) costs in things like electric vehicles. Instead of fat finger diameter 20' copper cables, you could replace them with tooth floss.

> HVDC and HVAC transmission lines already only see single digit transmission losses over hundreds of miles

Quite a bit of the world is thousands of miles from sunlight at any particular time. Being able to power Northern Europe off solar farms in the Sahara has the potential to fix a number of challenges with green energy.

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#183

Post by jacquesm »

borkt wrote: post #95
marshray wrote: post #70

Earlier quoted context omitted.

Multiple teams have said they had to produce 10 batches just to get one sample with properties worth reporting on. Perhaps the simplest explanation is that different teams are all ending up with different variations of a common material, with different impurities, crystal structure, etc. There's likely a whole zoo of interesting materials here!

More than likely there is only one interesting material in this specific composition. But understanding the phenomenon we are observing in this material can potentially lead to the development of other materials which display these characteristics, and tune those to function in this way at specific temperature/pressure situations. If we develop efficient ways to produce these materials in bulk (which is orders of mag…

> But the energy required to do this at scale will likely require our civilization to utilize orders of magnitude more energy

As opposed to smelting aluminum or steel? And that creates stuff that is dirt cheap in bulk...

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#184

Post by callalex »

modeless wrote: post #121

To me this is encouraging. 110K is really high! It's higher than YBCO which is what they make commercial "high temperature" superconducting tape out of. IMO if this is legit (I have no way of judging the source) then this is the first good third party evidence that the original researchers are not just doing some kind of fraud. A total fraud wouldn't have actually discovered a novel high-temperature, but not room tem…

What prediction markets are you looking at? Are there any concrete examples of these markets being accurate, or just a venue for gambling addicts to feel smart?

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#185

Post by bloopernova »

jacquesm wrote: post #31
fgeahfeaha wrote: post #15

That's a failed repro then right? Below 110K is below -163.15 Celcius How would that compare to other superconductors?

It is and it isn't. It's at ambient pressure (which is something useful), and there is something very odd happening much higher up that needs to be explained. They say their sample purity is higher than the one the Korean team had, so that would normally lead to better yield and easier confirmation of the superconductivity. But since it does show the Meissner effect in other samples as well at room temperature there…

I adore stories that include the phrase "that's odd" or "something odd happens when ..."

Even if we don't get the astonishing result originally claimed by the rogue paper, it's still a triumph of science in my ignorant opinion.

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#186

Post by tootie »

saberdancer wrote: post #148
modeless wrote: post #121

To me this is encouraging. 110K is really high! It's higher than YBCO which is what they make commercial "high temperature" superconducting tape out of. IMO if this is legit (I have no way of judging the source) then this is the first good third party evidence that the original researchers are not just doing some kind of fraud. A total fraud wouldn't have actually discovered a novel high-temperature, but not room tem…

I think most people are just seeing the headline 110K instead of realizing the implications (not a scam, not a mistake, hard to replicate). I was quite sceptical earlier today due to unconvincing videos but this finding pushes it heavily into "This might be it" territory.

I'm still unclear. Why is the test limit 110K? If this is supposed to be usable at ambient temperature then this seems like not a useful finding. Is it just some artifact of how superconductivity is measured?

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#187

Post by alephnerd »

grandpa wrote: post #180
alephnerd wrote: post #172

Earlier quoted context omitted.

What's the name of this book? It sounds really cool! Any other recommendations on books about the history of MatSE/Chemistry?

The title is "Excuse me sir, would you like to buy a kilo of isopropyl bromide?" https://archive.org/details/gergel_isopropyl_bromide

Thanks for the rec! Gunna dive into it tonight!

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#188

Post by mytailorisrich »

spandrew wrote: post #157
modeless wrote: post #121

To me this is encouraging. 110K is really high! It's higher than YBCO which is what they make commercial "high temperature" superconducting tape out of. IMO if this is legit (I have no way of judging the source) then this is the first good third party evidence that the original researchers are not just doing some kind of fraud. A total fraud wouldn't have actually discovered a novel high-temperature, but not room tem…

The initial claim was speculated to be room temp and ambient pressure superconduction. 110K is a far cry from that.

Looks like 110K still puts this in the top 5 highest temp known superconductors and it only takes a couple of days to produce out of the blue.

So even if that's all it sounds like an important discovery.

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#189

Post by _0ffh »

marcosdumay wrote: post #125
bigmattystyles wrote: post #75

Novice question - does a material behaving as a superconductor occur all the sudden like a step function if resistance is plotted against temp and pressure - or does it ease into super conductor behavior? (edit) Also is it resistance (aka if I remember my EE degree correctly), DC only or also impedance where frequency also matters?

It's like freezing water. It happens at a single temperature. It doesn't happen at once, there is a small amount of heat you must take from the material before it becomes a superconductor. Regions of it become superconductors on the process, and those grow until the entire material change. After the change, it becomes a stronger (yes, there is such a thing) superconductor the cooler it gets. (Or, at least that's what…

>After the change, it becomes a stronger (yes, there is such a thing) superconductor the cooler it gets

Do you mean the tradeoff between temperature, field strength and current? Like, if you lower the temperature, the SC will be able to handle a stronger field or more current in return?

Re: LK-99: Team of Southeast University observed zero resistance below 110 K

#190

Post by moffkalast »

p1mrx wrote: post #20
fgeahfeaha wrote: post #15

That's a failed repro then right? Below 110K is below -163.15 Celcius How would that compare to other superconductors?

Tc = 110 K would take the #4 spot on https://en.wikipedia.org/wiki/List_of_superconductors

> HgTlBaCaCuO

New band name. And band gap.

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