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TT: Fachverband Tiefe Temperaturen
TT 45: PtBi2 and Weyl Superconductors
TT 45.1: Talk
Wednesday, March 20, 2024, 11:30–11:45, H 3010
Unconventional Nernst effect in Weyl semimetal PtBi2 — •Federico Caglieris1,2,6, Michele Ceccardi1, 6, Dmitriy Efremov2, Grigory Shipunov2, Saicharan Aswartham2, Arthur Veyrat2, Joseph Dufouleur2, Christian Hess2, 4, 5, Bernd Büchner2, 3, 4, and Daniele Marré1,6 — 1CNR-SPIN, 16152 Genoa, Italy — 2IFW Dresden, 01069 Dresden, Germany — 3Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — 4Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany — 5Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany — 6University of Genoa, 16146 Genova, Italy
Trigonal PtBi2 represents an exceptional playground for the exploration of topological materials. In fact, it is a Weyl semimetal with broken inversion symmetry and strong spin-orbit coupling, showing also superconductivity at low temperatures. The Nernst effect has been proven to be a powerful technique to investigate the fermiology of unconventional materials and in systems characterized by non-trivial topology, it often assumes distinctive anomalous features, as observed in various Weyl semimetals. In this work, we deeply investigate the evolution of the Nernst coeffcient in a sigle crystal of trigonal-PtBi2 as a function of different parameters: temperature (T), magnetic field (B) and angle between the magnetic field direction and the c-axis of the sample. In particular, we found an unconvetional Nernst phenomenology, resulting from a combination of the peculiar Fermi surface of PtBi2, its non-trivial topology and the incipient superconductivity.
Keywords: Weyl semimetal; Nernst effect; transport properties; topology