Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session Correlated Electrons 1

TT 17.5: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Evidence of fully-gapped superconductivity in the locally noncentrosymmetric heavy-fermion system CeRh₂As₂ — •Seunghyun Khim¹, Manuel Brando¹, Jacintha Banda¹, Oliver Stockert¹, Zurab Guguchia², Robert Scheuermann², and Christoph Geibel¹ — ¹Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany — ²Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland

Recently, we have discovered unconventional superconducting behavior in CeRh₂As₂. The upper critical field (H_c2) which exceeds by far the Pauli limit indicates the Rashba-type spin-polarized electronic structure originating from the lack of local inversion symmetry. Coexistence of superconductivity with a possible quadrupolar order is suggestive of multipolar quantum criticality. Here, we present a study of the superconducting state of CeRh₂As₂ using muon spin rotation/relaxation (µSR) experiments. Results of transverse-field µSR experiments confirm bulk superconductivity and suggest a fully-gapped superconductivity order parameter. We discuss this finding together with the low-temperature specific-heat data.