单轴压力下 Sr2RuO4 的高灵敏度热容测量
超导电性
2021-03-04 v1 强关联电子
摘要
关于 SrRuO 非常规超导性的一个关键问题仍在于其序参量是单分量还是双分量。在双分量超导的假设下，单轴压力预期会解除二者的简并，导致分裂的相变。探测分裂相变最直接且根本的手段是热容。在此，我们报道了对承受大而高度均匀单轴压力的样品的热容测量。我们对任何第二相变的热容特征设定了上限，其不超过主超导相变热容特征的百分之几。归一化热容跃变 随单轴压力平滑增大，这有利于那些被允许在与被广泛研究的范霍夫奇点相同的布里渊区位置处取极大值的序参量。得益于我们测量的高精度，这些发现对 SrRuO 超导理论施加了严格约束。
引用
@article{arxiv.2103.02295,
title = {High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure},
author = {You-Sheng Li and Naoki Kikugawa and Dmitry A. Sokolov and Fabian Jerzembeck and Alexandra S. Gibbs and Yoshiteru Maeno and Clifford W. Hicks and Jörg Schmalian and Michael Nicklas and Andrew P. Mackenzie},
journal= {arXiv preprint arXiv:2103.02295},
year = {2021}
}
备注
This manuscript is an extended version of the scientific part of arXiv:1906.07597, which is being split into two separate papers. An extended discussion on the experimental methods can be found at arXiv:2009.03125. It includes supplemental material