Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu2

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

doi:10.1088/1361-648X/ac9813

Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu₂

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

Authors

C Mielke Iii^{1

2}, H Liu^{3

4}, D Das¹, J-X Yin⁵, L Z Deng⁶, J Spring², R Gupta¹, M Medarde⁷, C-W Chu^{6

8}, R Khasanov¹, Z M Hasan^{5

9

10

11}, Y Shi^{3

4}, H Luetkens¹, Z Guguchia¹

Affiliations

¹ Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
² Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
³ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
⁴ University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
⁵ Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, NJ 08544, United States of America.
⁶ Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX, United States of America.
⁷ Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
⁸ Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America.
⁹ Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ 08540, United States of America.
¹⁰ Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America.
¹¹ Quantum Science Center, Oak Ridge, TN 37831, United States of America.

PMID: 36202080
DOI: 10.1088/1361-648X/ac9813

Abstract

We report muon spin rotation (µSR) experiments on the microscopic properties of superconductivity and magnetism in the kagome superconductor CeRu₂withTc≃5 K. From the measurements of the temperature-dependent magnetic penetration depthλ, the superconducting order parameter exhibits nodeless pairing, which fits best to an anisotropics-wave gap symmetry. We further show that theTc/λ^-2ratio is comparable to that of unconventional superconductors. Furthermore, the powerful combination of zero-field (ZF)-µSR and high-fieldµSR has been used to uncover magnetic responses across three characteristic temperatures, identified asT1∗≃110 K,T2∗≃65 K, andT3∗≃40 K. Our experiments classify CeRu₂as an exceedingly rare nodeless magnetic kagome superconductor.

Keywords: kagome lattice; magnetism; muon spin rotation; superconductivity.

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