Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Kondo Physics, f-Electron Systems and Heavy Fermions
TT 6.6: Vortrag
Montag, 5. September 2022, 16:15–16:30, H22
The quadrupole density wave and its interplay with supercon- ductivity in CeRh2As2: A thermodynamic study — •Pavlo Khanenko1, 2, Daniel Hafner1, Robert Küchler1, Jacintha Banda1, Thomas Lühmann1, Javier F. Landaeta1, Florian Bärtl3, Tommy Kotte3, Joachim Wosnitza2,3, Christoph Geibel1, Seunghyun Khim1, Elena Hassinger1,4, and Manuel Brando1 — 1Max Planck Institute for Chemical Physics of Solids, Germany — 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany — 3Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence, Germany — 4Technical University Munich, Germany
The heavy-fermion CeRh2As2 is a rare case of multi-phase superconductor (Tc = 0.26 K) located in the vicinity of a quantum critical point. Two different superconducting (SC) phases are observed for a magnetic field applied along the c-axis of the tetragonal locally-non-centrosymmetric crystalline structure. The upper critical field along c-axis (B ∥ c) is huge, Bc2 = 14 T, but with field within the basal ab-plane (B ⊥ c) only a single SC phase is observed with Bc2 = 2 T. Thermodynamic measurements have detected another non-magnetic phase transition at T0 = 0.4 K which was interpreted as a quadrupole-density-wave (QDW) state. Here, we present new zero-field-cooled and field-cooled specific heat and thermal expansion measurements on a single crystal of CeRh2As2 with B ∥ c and B ⊥ c. These allow to extend the phase diagram for B ∥ c and to discuss the interplay between the SC and QDW states.