Compressed hydrides as metallic hydrogen superconductors

@article{Quan2019CompressedHA,
  title={Compressed hydrides as metallic hydrogen superconductors},
  author={Yundi Quan and Soham Ghosh and Warren E. Pickett},
  journal={Physical Review B},
  year={2019}
}
The 2014-2015 prediction, discovery, and confirmation of record high temperature superconductivity above 200K in H$_3$S, followed by the 2018 extension to superconductivity in the 250-280K range in lanthanum hydride, marks a new era in the longstanding quest for room temperature superconductivity: quest achieved, at the cost of supplying 1.5-2 megabars of pressure. Predictions of numerous high temperature superconducting metal hydrides $XH_n$ ($X$=metal) have appeared, but are providing limited… 

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References

SHOWING 1-10 OF 60 REFERENCES
What superconducts in sulfur hydrides under pressure and why
The recent discovery of superconductivity at 190~K in highly compressed H$_{2}$S is spectacular not only because it sets a record high critical temperature, but because it does so in a material that
Quantum Crystal Structure in the 250 K Superconducting Lanthanum Hydride
The discovery of superconductivity at 200 K in the hydrogen sulfide system at large pressures [1] was a clear demonstration that hydrogen-rich materials can be high-temperature superconductors. The
Superconductivity at 250 K in lanthanum hydride under high pressures
TLDR
A lanthanum hydride compound at a pressure of around 170 gigapascals is found to exhibit superconductivity with a critical temperature of 250 kelvin, the highest critical temperature that has been confirmed so far in a superconducting material.
Tellurium Hydrides at High Pressures: High-Temperature Superconductors.
TLDR
The prediction of high-T_{c} superconductivity in tellurium hydrides stabilized at megabar pressures identified by first-principles calculations in combination with a swarm structure search is reported.
High temperature superconductivity in sulfur and selenium hydrides at high pressure
Abstract Due to its low atomic mass, hydrogen is the most promising element to search for high-temperature phononic superconductors. However, metallic phases of hydrogen are only expected at extreme
Compressed sodalite-like MgH6 as a potential high-temperature superconductor
Recently, an experimental work reported a very high Tc of ∼190 K in hydrogen sulphide (H2S) at 200 GPa. The search for new superconductors with high superconducting critical temperatures in
Superconductive sodalite-like clathrate calcium hydride at high pressures
TLDR
In the stoichiometry CaH6 a body-centered cubic structure with hydrogen that forms unusual “sodalite” cages containing enclathrated Ca stabilizes above pressure 150 GPa, and the resultant dynamic Jahn–Teller effect helps to enhance electron–phonon coupling and leads to superconductivity of CaH 6.
High-temperature superconductivity in alkaline and rare earth polyhydrides at high pressure: A theoretical perspective.
TLDR
This Perspective focuses on the alkaline earth and rare earth polyhydrides whose superconducting critical temperature, Tc, was predicted to be above the boiling point of liquid nitrogen.
Potential high-Tc superconducting lanthanum and yttrium hydrides at high pressure
TLDR
The study suggests that dense hydrides consisting of lanthanum and yttrium and related hydrogen polyhedral networks may represent new classes of potential very high-temperature superconductors.
Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system
TLDR
S sulfur hydride is investigated, and it is argued that the phase responsible for high-Tc superconductivity in this system is likely to be H3S, formed from H2S by decomposition under pressure, which raises hope for the prospects for achieving room-temperature super conductivity in other hydrogen-based materials.
...
1
2
3
4
5
...