Decoupling multiphase superconductivity from normal state ordering in CeRh2As2

Semeniuk, K.; Hafner, D.; Khanenko, P.; Lühmann, T.; Banda, J.; Landaeta, J. F.; Geibel, C.; Khim, S.; Hassinger, E.; Brando, M.

doi:10.1103/PhysRevB.107.L220504

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Decoupling multiphase superconductivity from normal state ordering in CeRh₂As₂

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Semeniuk, K.
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hafner, D.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Khanenko, P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126740

Lühmann, T.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Banda, J.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Landaeta, J. F.
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel, C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Khim, S.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

Hassinger, E.
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Brando, M.
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Semeniuk, K., Hafner, D., Khanenko, P., Lühmann, T., Banda, J., Landaeta, J. F., et al. (2023). Decoupling multiphase superconductivity from normal state ordering in CeRh₂As₂. Physical Review B, 107(22): L220504, pp. 1-5. doi:10.1103/PhysRevB.107.L220504.

Cite as: https://hdl.handle.net/21.11116/0000-000D-A1F7-6

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. © 2023 authors. Published by the American Physical Society.