Vortex Phase Dynamics in Yttrium Superhydride YH6 at Megabar Pressures

被引：9

作者：

Sadakov, Andrey V. ^{[1
]}

Vlasenko, Vladimir A. ^{[1
]}

Troyan, Ivan A. ^{[2
]}

Sobolevskiy, Oleg A. ^{[1
]}

Semenok, Dmitrii V. ^{[4
]}

Zhou, Di ^{[4
]}

Pudalov, Vladimir M. ^{[1
,3
]}

机构：

[1] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia

[2] Russian Acad Sci, Shubnikov Inst Crystallog, Fed Sci Res Ctr Crystallog & Photon, Moscow 119333, Russia

[3] Natl Res Univ Higher Sch Econ, Moscow 101000, Russia

[4] Ctr High Pressure Sci & Technol Adv Res, Beijing 100193, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2023年 / 14卷 / 29期

关键词：

TEMPERATURE; SUPERCONDUCTIVITY; MAGNETORESISTANCE; RESISTIVITY; HYDRIDE;

D O I：

10.1021/acs.jpclett.3c01577

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A comprehensive study of vortex phases and vortex dynamicsispresented for a recently discovered high-temperature superconductorYH(6) with T (c)(onset) of 215 Kunder a pressure of 200 GPa. The thermal activation energy (U (0)) is derived within the framework of the thermallyactivated flux flow (TAFF) theory. The activation energy yields apower law dependence U (0) & PROP; H (& alpha;) on magnetic field with a possible crossoverat a field around 8-10 T. Furthermore, we have depicted thevortex phase transition from the vortex-glass to vortex-liquid stateaccording to the vortex-glass theory. Finally, vortex phase diagramis constructed for the first time for superhydrides. Very high estimatedvalues of flux flow barriers U (0)(H) = (1.5-7) x 10(4) K together withhigh crossover fields make YH6 a rather outstanding superconductoras compared to most cuprates and iron-based systems. The Ginzburgnumber for YH6 Gi = (3-7) x10(-3) indicates that thermal fluctuations are notso strong and cannot broaden superconducting transitions in weak magneticfields.

引用

页码：6666 / 6671

页数：6