Ultrasound evidence for a two-component superconducting order parameter in Sr2RuO4

被引：93

作者：

Benhabib, S. ^{[1
]}

Lupien, C. ^{[2
]}

Paul, I. ^{[3
]}

Berges, L. ^{[1
]}

Dion, M. ^{[2
]}

Nardone, M. ^{[1
]}

Zitouni, A. ^{[1
]}

Mao, Z. Q. ^{[4
,5
]}

Maeno, Y. ^{[4
,6
]}

Georges, A. ^{[7
,8
,9
,10
]}

Taillefer, L. ^{[2
,6
]}

Proust, C. ^{[1
,6
]}

机构：

[1] UPS, CNRS, Lab Natl Champs Magnet Intenses, EMFL,INSA,UGA, Toulouse, France

[2] Univ Sherbrooke, Dept Phys & RQMP, Inst Quant, Sherbrooke, PQ, Canada

[3] Univ Paris, CNRS, Lab Mat & Phenomenes Quant, Paris, France

[4] Kyoto Univ, Dept Phys, Kyoto, Japan

[5] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[6] CIFAR, Toronto, ON, Canada

[7] Coll France, Paris, France

[8] Flatiron Inst, Ctr Computat Quantum Phys, New York, NY USA

[9] Univ Paris Saclay, CNRS, Ecole Polytech, CPHT, Palaiseau, France

[10] Univ Geneva, Dept Quantum Matter Phys, Geneva, Switzerland

来源：

NATURE PHYSICS | 2021年 / 17卷 / 02期

基金：

加拿大创新基金会; 欧洲研究理事会; 英国工程与自然科学研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

TIME-REVERSAL SYMMETRY;

D O I：

10.1038/s41567-020-1033-3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ultrasound experiments show that the superconducting order parameter in strontium ruthenate must have two components. The quasi-two-dimensional metal Sr(2)RuO(4)is one of the best characterized unconventional superconductors, yet the nature of its superconducting order parameter is still under debate(1-3). This information is crucial to determine the pairing mechanism of Cooper pairs. Here we use ultrasound velocity to probe the superconducting state of Sr2RuO4. This thermodynamic probe is sensitive to the symmetry of the material, and therefore, it can help in identifying the symmetry of the superconducting order parameter(4,5). Indeed, we observe a sharp jump in the shear elastic constantc(66)as the temperature is increased across the superconducting transition. This directly implies that the superconducting order parameter is of a two-component nature. On the basis of symmetry arguments and given the other known properties of Sr2RuO4(refs.(6-8)), we discuss which states are compatible with this requirement and propose that the two-component order parameter {d(xz);d(yz)} is the most likely candidate.

引用

页码：194 / +

页数：6

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