Decoupling multiphase superconductivity from normal state ordering in CeRh2As2
K. Semeniuk, D. Hafner, P. Khanenko, T. Lühmann, J. Banda, J. F. Landaeta, C. Geibel, S. Khim, E. Hassinger, M. Brando
DOI 10.1103/PhysRevB.107.L220504 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeRh2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.26 | Pressure not reported | unknown |
| CeRh2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.31 | Pressure not reported | unknown |
| CeRh2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.38 | Pressure not reported | onset |
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