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Ultrasound evidence for a two-component superconducting order parameter in Sr 2 RuO 4
Nature Physics ( IF 17.6 ) Pub Date : 2020-09-21 , DOI: 10.1038/s41567-020-1033-3
S. Benhabib , C. Lupien , I. Paul , L. Berges , M. Dion , M. Nardone , A. Zitouni , Z. Q. Mao , Y. Maeno , A. Georges , L. Taillefer , C. Proust

The quasi-two-dimensional metal Sr2RuO4 is one of the best characterized unconventional superconductors, yet the nature of its superconducting order parameter is still under debate1,2,3. 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 parameter4,5. Indeed, we observe a sharp jump in the shear elastic constant c66 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. 6,7,8), we discuss which states are compatible with this requirement and propose that the two-component order parameter {dxz; dyz} is the most likely candidate.



中文翻译:

Sr 2 RuO 4中两组分超导阶数参数的超声证据

准二维金属Sr 2 RuO 4是最典型的非常规超导体之一,但其超导阶数参数的性质仍在讨论1,2,3中。此信息对于确定Cooper对的配对机制至关重要。在这里,我们使用超声速度来探测Sr 2 RuO 4的超导状态。该热力学探针对材料的对称性敏感,因此可以帮助识别超导阶数参数4,5的对称性。确实,我们观察到了剪切弹性常数c 66的急剧变化随着超导转变温度的升高。这直接暗示超导阶数参数具有两部分性质。根据对称性参数并给出Sr 2 RuO 4的其他已知性质(参考文献6,7,8),我们讨论了哪些状态与该要求兼容,并提出了两组分阶数参数{ d x z ; d y z }是最有可能的候选者。

更新日期:2020-09-21
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