Mixed pairing symmetry in κ-(BEDT-TTF)2X organic superconductors from ultrasonic velocity measurements

被引：15

作者：

Dion, Maxime ^{[1
]}

Fournier, David ^{[1
]}

Poirier, Mario ^{[1
]}

Truong, Kim D. ^{[1
]}

Tremblay, A. -M. S. ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Regroupement Quebecois Mat Pointe, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 22期

基金：

加拿大自然科学与工程研究理事会;

关键词：

elastic constants; organic superconductors; superconducting transitions; ultrasonic velocity measurement; T-C; LATTICE; PHASE; UPT3; FLUCTUATIONS; TRANSITION;

D O I：

10.1103/PhysRevB.80.220511

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Discontinuities in elastic constants are detected at the superconducting transition of layered organic conductors kappa-(BEDT-TTF)(2)X by longitudinal and transverse ultrasonic velocity measurements. Symmetry arguments show that discontinuities in shear elastic constants can be explained in the orthorhombic compound only if the superconducting order parameter has a mixed character that can be of two types, either A(1g)+B-1g or B-2g+B-3g in the classification of irreducible representations of the orthorhombic point group D-2h. Consistency with other measurements suggests that the A(1g)+B-1g(d(xy)+d(z(x+y))) possibility is realized. Such clear symmetry-imposed signatures of mixed order parameters have not been observed in other superconducting compounds.

引用

页数：4

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