Predicted Nearly Room Temperature Superconductivity in Binary Metal Hydride Systems
ORAL
Abstract
Due to the low atomic mass and high electron-phonon coupling strength
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.
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.
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Presenters
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Tianran Chen
National Institute of Standards and Technology and University of Maryland, College Park, MD
Authors
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Tianran Chen
National Institute of Standards and Technology and University of Maryland, College Park, MD
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Taner Yildirim
National Institute of Standards and Technology and University of Maryland, College Park, MD, NIST Center for Neutron Research, National Institute of Standards and Technology