Synthesis and Superconductivity in yttrium superhydrides under high pressure

Abstract

The flourishing rare earth superhydrides are a class of recently discovered materials that possess near-room-temperature superconductivity at high pressures, opening a new era of superconductivity research at high pressures. Among these superhydrides, yttrium superhydrides attracted great interest owing to their abundance of stoichiometries and excellent superconductivities. Here, we carried out a comprehensive study of yttrium superhydrides in a wide pressure range of 145-300 GPa. We successfully synthesized a series of superhydrides with the compositions of YH4, YH6, YH7, and YH9, and reported their superconducting transition temperatures of 82 K at 167 GPa, 218 K at 165 GPa, 29 K at 162 GPa, and 230 K at 300 GPa, respectively, which were evidenced by a sharp drop of resistivity. The structure and superconductivity of YH4, which was taken as a representative example, were also examined by X-ray diffraction measurements and the suppression of the superconductivity under external magnetic fields, respectively. Clathrate YH10 as a candidate of room-temperature superconductor was not synthesized within the studied pressure and temperature ranges of up to 300 GPa and 2000 K, respectively. The current work created a detailed platform for further searching room-temperature superconductors in polynary yttrium-based superhydrides.

References in corpus (3)

• Superconductive "sodalite"-like clathrate calcium hydride at high pressures
• Superconductivity to 262 kelvin via catalyzed hydrogenation of yttrium at high pressures
• Nonstandard superconductivity or no superconductivity in hydrides under high pressure

Cited by in corpus (12)

• Efficient route to achieve superconductivity improvement via substitutional La-Ce alloy superhydride at high pressure
• Effect of Doping on the phase stability and Superconductivity in LaH10
• A-15 type superconducting hydride $L{a}_4{H}_{23}$: Nanograined structure with low strain, strong electron-phonon interaction, and moderate level of nonadiabaticity
• Theoretical Prediction of High-Temperature Superconductivity in SrAuH${}_3$ at Ambient Pressure
• Hydride Units Filled B--C Clathrate: A New Pathway for High-Temperature Superconductivity at Ambient Pressure
• $d$-wave superconductivity as a model for diborides apart MgB${}_2$
• Pressure-induced superconductivity reentrant in transition metal dichalcogenide TiSe2
• Superconductor discovery in the emerging paradigm of Materials Informatics
• Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite
• Anharmonicity and Coulomb pseudopotential effects on superconductivity in YH${}_6$ and YH${}_9$
• The Isotope Effect and Critical Magnetic Fields of Superconducting YH${}_6$: A Migdal-Eliashberg Theory Approach
• Superconducting ternary compounds Li-X-B (X=Mo, W) within the mild pressure range: First-principles predictions