Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: f-Electron Systems and Heavy Fermions

TT 38.2: Talk

Wednesday, April 3, 2019, 10:00–10:15, H23

Study of the low-temperature resistivity of the locally non-centrosymmetric heavy-fermion superconductor CeRh₂As₂ — •Daniel Hafner, Jacintha Banda, Seunghyun Khim, Christoph Geibel, and Manuel Brando — Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

CeRh₂As₂ is a novel locally non-centrosymmetric heavy fermion superconductor with a transition temperature T_c ≈ 0.3 K. A second weak transition has been observed in specific heat at a temperature T₀ just above T_c and it is suspected to be of quadrupolar nature. We present a comprehensive study of the low temperature resistivity of CeRh₂As₂ in which we could observe signatures of both phase transitions. We have investigated the evolution of T_c and T₀ and the resistivity exponent n, with ρ(T) = ρ₀ + ATⁿ, in magnetic field parallel and perpendicular to the crystallographic c-axis up to 18 T. The resulting phase diagrams are presented. We then discuss the evolution of the observed phases in relation to the lack of local inversion symmetry in the Ce sites, quadrupolar order and quantum criticality.