Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 52: Heavy Fermions
TT 52.1: Talk
Wednesday, March 11, 2026, 15:00–15:15, HSZ/0103
High-field muon spin resonance/rotation (µSR) studies on CeRh2As2 — •Seunghyun Khim1, Oliver Stockert1, Andrin Doll2, and Robert Scheuermann2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Paul Scherrer Institute, Villigen, Switzerland
The heavy-fermion CeRh2As2 with Tc = 0.35 K exhibits unique two-phase superconductivity under a c-axis magnetic field. In the superconducting (SC) state, a field-induced transition at H* = 4 T separates a low-field even-parity (SC1) phase from a high-field odd-parity (SC2) phase. In addition, an unusual ordering of the Ce-4f moments emerges below T0 = 0.55 K, which is suppressed with increasing c-axis field. The T0 phase boundary smoothly extends into the SC2 phase and persists to zero temperature at approximately 7 T. Previous zero-field µSR studies have identified that an internal field develops spontaneously below T0 and becomes nearly saturated below Tc, suggesting a possible correlation between the magnetic order and superconductivity. Here, we present following high-field µSR measurements up to 7.5 T. Temperature-dependent measurements at 2 T show that the internal field is fully established below 0.3 K, coinciding with the onset of the SC1 phase. Furthermore, field-dependent measurements at 20 mK reveal that the internal field begins to be suppressed above 4 T and then vanishes entirely at around 7 T. These observations propose that the magnetic order in the T0 phase is locked in exclusively within the SC1 phase, reflecting an intricate coupling between the magnetic and SC order parameters.
Keywords: muon spin rotation; magnetism; superconductivity