Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu2

C. Mielke, 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

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6 Scopus citations

Abstract

We report muon spin rotation (µSR) experiments on the microscopic properties of superconductivity and magnetism in the kagome superconductor CeRu2 with T c ≃ 5 K. From the measurements of the temperature-dependent magnetic penetration depth λ, the superconducting order parameter exhibits nodeless pairing, which fits best to an anisotropic s-wave gap symmetry. We further show that the T c /λ −2 ratio is comparable to that of unconventional superconductors. Furthermore, the powerful combination of zero-field (ZF)-µSR and high-field µSR has been used to uncover magnetic responses across three characteristic temperatures, identified as T 1 ∗ ≃ 110 K, T 2 ∗ ≃ 65 K, and T 3 ∗ ≃ 40 K. Our experiments classify CeRu2 as an exceedingly rare nodeless magnetic kagome superconductor.

Original languageEnglish (US)
Article number485601
JournalJournal of Physics Condensed Matter
Volume34
Issue number48
DOIs
StatePublished - Nov 30 2022

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • General Materials Science

Keywords

  • kagome lattice
  • magnetism
  • muon spin rotation
  • superconductivity

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