Berlin 2024 – scientific programme
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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 (Tc = 0.3 K) of the heavy-fermion compound CeRh2As2 emerges from an unknown ordered state below To = 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 TN very close to the Tc of the SC state. However, thermodynamic bulk measurements have not yet detected any anomalies associated with this TN 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