Claim of Superconductivity Above 0C
nextbigfuture.com
Claim of Superconductivity Above 0C
1–10 of 35 posts
Re: Claim of Superconductivity Above 0C
#2This is momentous news, if it's reproducible... at 277K, we're 6-12 degrees away from the ground temperature ~10ft below almost anywhere in the world ( http://www1.eere.energy.gov/geothermal/geothermal_basics.htm...)
Re: Claim of Superconductivity Above 0C
#3This sounds pretty exciting, but I havent seen any confirmation other than blog posts. Without a paper or technical-report, I remain skeptical.
Re: Claim of Superconductivity Above 0C
#4I want to believe this so bad. I'm just ... leery of one-man research being published on a blog.
Re: Claim of Superconductivity Above 0C
#5As a lapsed superconductivity physicist, I hate to burst the bubble. In the community there has been a long-standing joke about USOs, Unidentified Superconducting Objects, and it is well known that just because you see "Signs of Superconductivity" does not prove that something is superconducting.
There are really three questions at hand: 1> Does the sample show the Meissner effect, 2> Does it show zero resistance, and 3> Is it stable under addition of impurities. It turns out that for most ceramic compounds, even if 1 is true, 2 and 3 are often not true. For example, the Cuprates (the first to cross the 77K mark) actually have a higher resistance close to the critical temperature than copper. Point 3 is especially damning as sensitivity to impurities also means you can't draw these things into wires (certainly not wires you can bend) as the very act of bending may introduce defects that change local concentration of ingredients and hurt the superconductivity.
So the burden of proof remains very high, and the small blurb is very underwhelming.
Re: Claim of Superconductivity Above 0C
#6I'll believe it when it's peer reviewed and reproduced.
Re: Claim of Superconductivity Above 0C
#7Out of curiosity is "superconductivity" an "all or nothing" phenomenon?
ie. Is there such a thing as semi-superconductive?
Re: Claim of Superconductivity Above 0C
#8I want to believe this so bad. I'm just ... leery of one-man research being published on a blog.
Then, too, I also badly want to believe in the concept of one-man research published on a blog.
Re: Claim of Superconductivity Above 0C
#9I'll believe it when it's peer reviewed and reproduced.
It has been reproduced and journallized by Sharif University in Iran.
It looks legit, but his spec sheet does indicate that there are problems with commercialisation. http://www.superconductors.org/276K.htm indicates how to reproduce and what results to expect. A regular freezer can sustain -5C to 5C. An ammonia freezer can go as low as -27C, so 3C is easy to hold.
And the fact that he has been known for good results in the past shows, at least to me that this is the real thing. But of course, always the skeptic in these kinds of claims. At least it's not cold fusion, yet ;)
Re: Claim of Superconductivity Above 0C
#10Out of curiosity is "superconductivity" an "all or nothing" phenomenon? ie. Is there such a thing as semi-superconductive?
Yes, all or nothing.
Resistance does go lower as temperature drops, but when you hit the transition temperature it suddenly drops to zero.
There are other unusual things that happen too, and only with superconductors.
One of the main ones is that Meissner effect they talked about - that's the exclusion of magnetic fields from inside the superconductor, and regular conductors don't do that.