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TT: Fachverband Tiefe Temperaturen

TT 11: Heavy Fermions

TT 11.4: Talk

Monday, March 18, 2024, 15:45–16:00, H 3005

Low-temperature muon spin relaxation (µSR) studies on quality-improved CeRh₂As₂ single crystals — •Seunghyun Khim¹, Oliver Stockert¹, Manuel Brando¹, Christoph Geibel¹, Thomas J. Hickens², Christopher Baines², and Hubertus Luetkens² — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²Paul Scherrer Institute, Villigen, Switzerland

The unusual superconducting (SC) state (T_c = 0.3 K) of the heavy-fermion compound CeRh₂As₂ emerges from an unknown ordered state below T_o = 0.55 K, the precise nature of which has not been determined. Nuclear quadrupole/magnetic resonance (NQR/NMR) studies have revealed a clear signature of an antiferromagnetic order with a T_N very close to the T_c of the SC state. However, thermodynamic bulk measurements have not yet detected any anomalies associated with this T_N transition. To elucidate the multiple identified phases and their correlations, we conducted muon spin relaxation (µSR) studies of local magnetic properties in quality-improved CeRh₂As₂ single crystals at low temperatures. The experimental results will be discussed based on the unique characteristics of the Ce-4f moments and its intricate relation with superconductivity.

Keywords: muon spin rotation; unconventional superconductor