Some remarks on possible superconductivity of composition Pb$_9$CuP$_6$O$_{25}$ · HackerPapers discussions

Some remarks on possible superconductivity of composition Pb$_9$CuP$_6$O$_{25}$ — mentioned by rsfern

Mon, 07 Aug 2023 10:07:39 GMT

Two reports have increased my patience factor a lot on this First, a theoretical study found that the phase that’s reported to be superconducting is likely to be metastable based on some density functional theory calculations. That implies that actually making it may be rather difficult, and raises the bar for reproductions to show exactly what they are finding is superconducting or not. https://arxiv.org/abs/2307.16892 The second study was a comparison of the properties of superconducting Pb thin films with some of the data people have been reporting on LK-99 repro attempts. The authors…

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Some remarks on possible superconductivity of composition Pb$_9$CuP$_6$O$_{25}$ — mentioned by httpz

Fri, 04 Aug 2023 08:37:46 GMT

>Most likely, the material LK99 as reported in [1-3] is a heterophase structure, with co-existent non-superconducting constituents. This may yield superconducting droplets surrounded by nonsuperconducting material... https://arxiv.org/abs/2308.01723 >In fact, I find that Cu on this Pb(2) is 1.08 eV more energetically favorable than Cu on the Pb(1) site, suggesting possible difficulties in robustly obtaining Cu substituted on the Pb(1) site. https://arxiv.org/abs/2307.16892 The paper from Dr. Griffin at LBNL suggests copper atoms have to be placed in a specific (but less likely) position in…

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Some remarks on possible superconductivity of composition Pb$_9$CuP$_6$O$_{25}$ — HN submission

Fri, 04 Aug 2023 01:00:19 GMT

Some remarks on possible superconductivity of composition Pb9CuP6O25

179 points; 92 discussion replies on HN. Paper and source history. A submission is not an endorsement.