Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.11: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

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

Recently, we have discovered a new heavy-fermion, locally non-centrosymmetric superconductor CeRh₂As₂ in the CeBe₂Ge₂ type structure with a transition temperature T_c ≈ 0.3 K. We present here a comprehensive study of its low-temperature specific heat and its behaviour in a magnetic field which was applied parallel and perpendicular to the crystallographic c-axis. We show that a second weak phase transition can be seen in specific heat at a temperature T₀ slightly above T_c. Its field dependence is similar to that of quadrupolar phases. After having subtracted the nuclear specific heat contribution due to the quadrupolar and Zeeman terms on the arsenic nuclear spins, we present the temperature and field dependence of the electronic specific heat coefficient γ = C(T, H)/T down to 40 mK and up to 12 T.