Multiband nature of room-temperature superconductivity in LaH10 at high pressure

被引:43
|
作者
Wang, Chongze
Yi, Seho
Cho, Jun-Hyung [1 ]
机构
[1] Hanyang Univ, Dept Phys, Res Inst Nat Sci, 222 Wangsimni Ro, Seoul 04763, South Korea
基金
新加坡国家研究基金会;
关键词
LATTICE-VIBRATIONS; TRANSITION; HYDROGEN; HYDRIDE; LANTHANUM; ELECTRONS;
D O I
10.1103/PhysRevB.101.104506
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Recently, the discovery of room-temperature superconductivity (SC) was experimentally realized in the fcc phase of LaH io under megabar pressures. This SC of compressed LaH10 has been explained in terms of strong electron-phonon coupling (EPC), but the detailed nature of how the large EPC constant and high superconducting transition temperature T-c are attained has not yet been clearly identified. Based on the density-functional theory and the Migdal-Eliashberg formalism, we reveal the presence of two nodeless, anisotropic superconducting gaps on the Fermi surface (FS). Here, the small gap is mostly associated with the hybridized states of H s and La f orbitals on the three outer FS sheets, while the large gap arises mainly from the hybridized state of neighboring H s or p orbitals on the one inner FS sheet. Further, we find that compressed YH10 with the same sodalitelike clathrate structure has the two additional FS sheets, enhancing EPC constant and T-c. It is thus demonstrated that the nature of room-temperature SC in compressed LaH10 and YH10 features the multiband pairing of hybridized electronic states with large EPC constants.
引用
收藏
页数:5
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