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X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
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DTSTART;TZID=Europe/Paris:20221107T140000
DTEND;TZID=Europe/Paris:20221107T180000
DTSTAMP:20221017T135900
UID:MEC-7059b7dea43da04fd342088d7c1698f0@lps.u-psud.fr
CREATED:20221017
LAST-MODIFIED:20221017
PRIORITY:5
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SUMMARY:Konstantin Semeniuk I Superconductivity and quadrupole density wave in CeRh2As2
DESCRIPTION:\nKonstantin Semeniuk, Max Planck Institute for Chemical Physics of Solids, Dresden, Germany\n\n\n\nThe Kondo lattice compound CeRh2As2 is an unconventional superconductor (Tc ≈ 0.3 K) exhibiting a first order transition between two distinct superconducting states when magnetic field is applied along the c axis of the tetragonal unit cell [1]. The high-field state is characterised by the odd-parity pairing and a purely orbital-limited upper critical field of at least 15 T [2]. One of the key ingredients for realising such a phase diagram is a strong Rashba spin-orbit coupling caused by the lack of local inversion symmetry at the Ce sites. Besides the superconductivity, CeRh2As2 also displays a phase transition at ~0.4 K, proposed to be a quadrupole-density-wave (QDW) instability [3].\n\n\n\nIn our latest experiments we investigated the interplay between the QDW state and superconductivity. Heat capacity and resistivity measurements on new higher-quality single crystals of CeRh2As2 clearly indicate that the QDW is not involved in the superconducting phase switching. This result is further reinforced by our high-pressure resistivity study, which at the same time strongly suggests the influence of the QDW order on the ab-plane upper critical field. We discuss potential scenarios of the interaction between the two states and consider their relevance in the context of quantum critical behaviour.\n\n\n\n[1] S. Khim & J. Landaeta et al., Science 373, 1012–1016 (2021).\n\n\n\n[2] J. Landaeta et al., Phys. Rev. X 12, 031001 (2022).\n\n\n\n[3] D. Hafner et al., Phys. Rev. X 12, 011023 (2022).\n
URL:https://www.lps.u-psud.fr/en/events/konstantin-semeniuk-i-superconductivity-and-quadrupole-density-wave-in-cerh2as2/
CATEGORIES:Seminar SMQ,Seminars
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