Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C47: MgB2, Complex Compounds, Organics, and Other Superconductors
3:00 PM–5:48 PM,
Monday, March 15, 2021
Sponsoring
Unit:
DCMP
Chair: John Wei, Univ of Toronto
Abstract: C47.00011 : Predicted Nearly Room Temperature Superconductivity in Binary Metal Hydride Systems*
5:00 PM–5:12 PM
Live
Presenter:
Tianran Chen
(National Institute of Standards and Technology and University of Maryland, College Park, MD)
Authors:
Tianran Chen
(National Institute of Standards and Technology and University of Maryland, College Park, MD)
Taner Yildirim
(National Institute of Standards and Technology and University of Maryland, College Park, MD)
in hydrogen-rich materials, hydride compounds under extremely high pressures are most promising
in the search of high-Tc superconductors. First-principles-based
computational search has become extremely important not only
in predicting new materials but also in guiding high-pressure experimental
measurements. In this work, we have developed a super-efficient and
fast method for searching high-Tc hydride superconductors. We
introduce new "metrics" that are strongly correlated to strong
electron-phonon coupling and Tc but it is much faster to calculate
them. Using our new method, we have searched more than 100,000 binary
hydride systems and discovered several new high-Tc superconductors.
Among them, we report our prediction of high-temperature
superconductivity at relatively low pressure in a novel binary metal
hydride which may break the current record. A detailed mechanism of
the superconductivity, phonons and electron-phonon coupling,
anharmonicity, as well as the abnormal Tc-pressure dependence,
will be also discussed.
*T.C. gratefully acknowledges research support from the NIST Fellow's Postdoctoral Research Program.
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