hot news

gippgig

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Jan 31, 2015, 4:41:57 PM1/31/15

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There is an unconfirmed report of superconductivity at 190K in hydrogen sulfide (egads!) at ultrahigh pressure (arxiv.org/abs/1412.0460). The fact that this hasn't been confirmed is worrisome but this is far from the typical case where a dozen labs can be testing a new superconductor in a few days.

Matthew Hines

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Jan 31, 2015, 7:23:22 PM1/31/15

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Static pressure on the order described, using the methods indicated, can be cost effectively maintained. However, the article doesn't seem to mention the critical current density. Will be interesting to see whether the discovery is actually competitive with existing superconductors.

On 01/31/2015 09:41 PM, gippgig wrote:

There is an unconfirmed report of superconductivity at 190K in hydrogen sulfide (egads!) at ultrahigh pressure (arxiv.org/abs/1412.0460). The fact that this hasn't been confirmed is worrisome but this is far from the typical case where a dozen labs can be testing a new superconductor in a few days.

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shawn wilson

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Feb 1, 2015, 2:11:24 AM2/1/15

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Cool

What's "This superconductivity likely associates with the dissociation of H2S, and formation of SHn (n>2) hydrides* mean?

Bobby Baum

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Feb 1, 2015, 2:44:15 AM2/1/15

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They suggest that H4S or H6S may be formed. (Note that the analogous
SF4 & SF6 are well known.)

gippgig

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Jul 8, 2015, 12:01:03 AM7/8/15

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It looks like this is real.
go.nature.com/xihjqw

summakor

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Jul 13, 2015, 1:03:47 AM7/13/15

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If it were a solid under pressure, OK... maybe there's a way to build in some stress in thin films. But in a gas... it's useful to anyone who lives inside a diamond anvil cell. It's the study and the resulting theory that would be most useful from this.

gippgig

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Sep 3, 2018, 4:49:21 PM9/3/18

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Preliminary evidence for superconductivity at up to +7 C (45 F) in LaH10 at ultrahigh pressure:
arxiv.org/abs/1808.07695
It's clear that there's a whole different high pressure world.

Tom Iddings

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Sep 4, 2018, 12:53:42 AM9/4/18

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What even is lanthanum decahydride

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James Sullivan

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Sep 4, 2018, 8:15:07 PM9/4/18

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Basically they just shove a bunch of extra protons into the electron cloud of a f or g valence metal. There's so much empty space in those higher orbitals and also shielding and distance from the nucleus the ions are free to zoom around at the speed of light. Aristocats!

From: bla...@hacdc.org <bla...@hacdc.org> on behalf of Tom Iddings <thymet...@gmail.com>
Sent: Tuesday, September 4, 2018 12:53:37 AM
To: Bla...@hacdc.org
Subject: Re: [HacDC:Blabber] hot news

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Nic S

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Sep 5, 2018, 2:33:32 AM9/5/18

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then simply inverse the nucleus and its cloud of high valence orbitals upside down then you apprently have this object in it's most stable state (PE < 0) and voila

gippgig

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May 27, 2019, 6:44:58 PM5/27/19

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This has now been published in Nature Vol. 569 p. 528 (Superconductivity at 250 K in lanthanum hydride under high pressures; also see p. 491) doi: 10.1038/s41586-019-1201-8

gippgig

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Sep 2, 2021, 11:20:17 PM9/2/21

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www.science.org/news/2021/08/thanks-bit-diamond-smashing-practical-room-temperature-superconductivity-could-be-close

Kevin Cole

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Sep 3, 2021, 9:13:07 AM9/3/21

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On Thu, Sep 2, 2021 at 11:20 PM gippgig <gip...@gmail.com> wrote:

www.science.org/news/2021/08/thanks-bit-diamond-smashing-practical-room-temperature-superconductivity-could-be-close

There's "room temperature" and then there's "room temperature" in Rochester, NY... in winter... ;-)

gippgig

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Sep 27, 2022, 2:57:55 PM9/27/22

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Not-so-hot news: www.science.org/content/article/something-seriously-wrong-room-temperature-superconductivity-study-retracted

(but this doesn't challenge the validity of the overall hydride superconductor class)