无节点磁性 Kagome 超导体 CeRu 的局域光谱证据。

Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu.

作者信息

Mielke Iii C, Liu H, Das D, Yin J-X, Deng L Z, Spring J, Gupta R, Medarde M, Chu C-W, Khasanov R, Hasan Z M, Shi Y, Luetkens H, Guguchia Z

机构信息

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.

Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.

出版信息

J Phys Condens Matter. 2022 Oct 18;34(48). doi: 10.1088/1361-648X/ac9813.

DOI:10.1088/1361-648X/ac9813

PMID:36202080

Abstract

We report muon spin rotation (SR) experiments on the microscopic properties of superconductivity and magnetism in the kagome superconductor CeRuwithTc≃5 K. From the measurements of the temperature-dependent magnetic penetration depth, the superconducting order parameter exhibits nodeless pairing, which fits best to an anisotropic-wave gap symmetry. We further show that theTc/ratio is comparable to that of unconventional superconductors. Furthermore, the powerful combination of zero-field (ZF)-SR and high-fieldSR has been used to uncover magnetic responses across three characteristic temperatures, identified asT1∗≃110 K,T2∗≃65 K, andT3∗≃40 K. Our experiments classify CeRuas an exceedingly rare nodeless magnetic kagome superconductor.

摘要

我们报道了对层状超导体CeRu（Tc≃5 K）中超导性和磁性微观性质的μ子自旋旋转（SR）实验。通过对与温度相关的磁穿透深度的测量，超导序参量呈现无节点配对，这与各向异性波能隙对称性最为契合。我们进一步表明，Tc/比值与非常规超导体的相当。此外，零场（ZF）-SR和高场SR的强大组合已被用于揭示跨越三个特征温度（分别确定为T1∗≃110 K、T2∗≃65 K和T3∗≃40 K）的磁响应。我们的实验将CeRu归类为极为罕见的无节点磁性层状超导体。