SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Unconventional Superconductors
TT 19.3: Vortrag
Donnerstag, 30. September 2021, 11:45–12:00, H6
Angular dependence of the superconductivity in CeRh2As2 — •Javier Landaeta1, Pavlo Khanenko1, Jacinta Banda1, Ilya Sheikin2, Sanu Mishra2, Seunghyun Khim1, Manuel Brando1, Christoph Geibel1, and Elena Hassinger1 — 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 2Univ. Grenoble Alpes, CNRS, LNCMI EMFL, F-38042 Grenoble, France
CeRh2As2 is an unconventional superconductor with multiple superconducting phases. When µ0H∥ c, this material shows a field-induced transition from a low-field superconducting state SC1 to a high-field SC2 with critical field Hc2 = 14 T and Tc = 0.26 K. For µ0H∥ ab, only the SC1 with Hc2 = 2 T is observed. The phase-diagrams and their anisotropy might be explained by the influence of Rashba-spin-orbit coupling at the Ce sites where the inversion symmetry is broken locally. Above Tc, a possibly quadrupolar phase is present at T0 ≈ 0.4 K, whose influence on the superconducting state remains unknown. Here, we present a comprehensive study of the angular dependence of the upper critical fields and T0 using low temperature magnetic ac susceptibility, specific heat and torque in single crystalline CeRh2As2. The SC2 state is strongly suppressed when rotating the magnetic field away from the c-axis and disappears for an angle of 35∘. We find that the Hc2 of SC2 for angles departing from the c axis is attained when the in-plane component of the field reaches the in-plane Pauli limit. This result corroborates idea that the field-induced state SC2 is an odd-parity state with a d-vector in the plane in CeRh2As2.