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TT: Fachverband Tiefe Temperaturen
TT 28: Unconventional Superconductors
TT 28.3: Talk
Wednesday, March 29, 2023, 10:00–10:15, HSZ 103
High pressure study of the unconventional superconductor CeRh2As2 — •Meike Pfeiffer1, Konstantin Semeniuk2, Seunghyun Khim2, and Elena Hassinger1 — 1Technische Universität Dresden Institut für Festkörper- und Materialphysik, 01069 Dresden — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden
The heavy-fermion superconductor CeRh2As2 hosts two distinct superconducting states which are currently understood as even- and odd-parity states. The compound crystallizes in a layered lattice that is globally centrosymmetric but lacks local inversion symmetry at the Ce sites. This results in a strong spin-orbit coupling, believed to lead to a very high ratio of upper critical field (> 15 T) to critical temperature (Tc = 0.26 K). The normal state of the compound hosts an additional phase below 0.4 K, believed to be a quadrupole-density wave (QDW) order. We present a high-pressure electrical resistivity study of CeRh2As2 across different generations of samples. The QDW order is highly sensitive to lattice compression and gets fully suppressed at Pc≈ 0.6 GPa. The superconducting transition temperature Tc decreases at a significantly lower rate, and both superconducting phases persist well above 2 GPa. Thus, we confirm that the QDW is not responsible for the phase switching from even- to odd-parity state. At the same time, the in-plane magnetic field peaks at Pc, suggesting a different kind of interplay between the two orders.