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TT: Fachverband Tiefe Temperaturen
TT 61: Topology – Poster
TT 61.5: Poster
Mittwoch, 11. März 2026, 15:00–17:00, P4
Temperature and pressure dependant structural studies of PtBi2 — •Esteban Aguirre García1, Swarnamayee Mishra1,2, and Jochen Geck1,2 — 1Institute of Solid State and Materials Physics, Technical University Dresden, 01062 Dresden, Germany — 2Würzburg-Dresden Cluster of Excellence ct.qmat, Technical University Dresden, 01062 Dresden, Germany
Trigonal PtBi2 is a non-centrosymmetric Weyl semimetal (space group P31m) in which strong spin-orbit coupling and broken inversion symmetry lift the degeneracy of linearly dispersing bands, providing a natural setting for topological superconductivity. While bulk PtBi2 becomes superconducting only at very low temperatures of about 0.6 K, an enhanced and robust surface superconducting state with a critical temperature of 5 K or higher has been shown to emerge from the Fermi arc surface states, accompanied by a sizeable superconducting gap. In this work, high resolution single crystal X-Ray diffraction is employed as a function of temperature and pressure, which allows us to correlate structural features of the trigonal phase with the presence of surface superconductivity and to identify possible symmetry based mechanisms that can support topological pairing.
Keywords: Weyl Semimetal; X-Ray Diffraction; Surface Superconductivity; Hydrostatic Pressure