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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: f-Electron Systems and Heavy Fermions

TT 38.2: Vortrag

Mittwoch, 3. April 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 Tc ≈ 0.3 K. A second weak transition has been observed in specific heat at a temperature T0 just above Tc 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 Tc 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.

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