Symmetry change of d-wave superconductivity in κ-type organic superconductors

被引：13

作者：

Imajo, S. ^{[1
,2
]}

Kindo, K. ^{[2
]}

Nakazawa, Y. ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

PHYSICAL REVIEW B | 2021年 / 103卷 / 06期

基金：

日本学术振兴会;

关键词：

HEAT;

D O I：

10.1103/PhysRevB.103.L060508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic-field-angle-resolved heat capacity of dimer-Mott organic superconductors kappa-(BEDT-TTF)(2)X is reported (BEDT-TTF and X represent bis(ethylenedithio)tetrathiafulvalene and a monovalent anion, respectively). Temperature and field dependence of heat capacity indicates that the superconductivity has line nodes on the Fermi surface, which is a typical feature of d-wave superconductivity. In-plane field-angle dependence exhibits fourfold oscillations as well as twofold oscillations due to anisotropy of superconducting gap functions. From analyses of the fourfold term, the gap symmetry is determined as d(x2-y2) + s(+/-) for X = Cu[N(CN)(2)]Br and d(xy) for X = Ag(CN)(2)H2O. We suggest that the symmetry difference comes from the competition of d(xy) and d(x2-y2) antiferromagnetic fluctuations depending on lattice geometry.

引用

页数：5

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