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  • Letter
  • Open Access

Decoupling multiphase superconductivity from normal state ordering in CeRh2As2

K. Semeniuk1,*, D. Hafner1, P. Khanenko1, T. Lühmann1, J. Banda1, J. F. Landaeta1, C. Geibel1, S. Khim1, E. Hassinger2,† et al.

M. Brando1,‡

  • 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 2TUD Dresden University of Technology, Institute for Solid State and Materials Physics, D-01062 Dresden, Germany

  • *Corresponding author: konstantin.semeniuk@cpfs.mpg.de
  • †Corresponding author: elena.hassinger@tu-dresden.de
  • ‡Corresponding author: manuel.brando@cpfs.mpg.de
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Phys. Rev. B 107, L220504 – Published 20 June, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L220504

Abstract

CeRh2As2 is a multiphase superconductor with Tc=0.26 K. The two superconducting (SC) phases, SC1 and SC2, observed for a magnetic field H parallel to the c axis of the tetragonal unit cell, have been interpreted as even- and odd-parity SC states, separated by a phase boundary at μ0H*=4 T. Such parity switching is possible due to a strong Rashba spin-orbit coupling at the Ce sites located in locally noncentrosymmetric environments of the globally centrosymmetric lattice. The existence of another ordered state (phase I) below a temperature T0≈0.4 K suggests an alternative interpretation of the H* transition: It separates a mixed SC+I (SC1) and a pure SC (SC2) state. Here, we present a detailed study of higher-quality single crystals of CeRh2As2, showing much sharper signatures at Tc=0.31 K and T0=0.48 K. We refine the T−H phase diagram of CeRh2As2 and demonstrate that T0(H) and Tc(H) lines meet at μ0H≈6 T, well above H*, implying no influence of phase I on the SC phase switching. A basic analysis with the Ginzburg-Landau theory indicates a weak competition between the two orders.

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References (36)

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Phys. Rev. B 107, L220504– Published 20 June, 2023
  • Received 20 January 2023
  • Revised 21 April 2023
  • Accepted 7 June 2023
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