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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity – Poster II
TT 93.5: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
From surface to bulk: Superconductivity in doped γ-PtBi2 — •Joshy Kochummachen Oommen, Manaswini Sahoo, Luminita Harnagea, Sabine Wurmehl, Anja Wolter-Giraud, and Bernd Büchner — Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
Trigonal platinum bismuthide (γ-PtBi2) has recently attracted significant interest due to the observation of superconductivity and its topologically protected surface states. So far, superconductivity has been detected only through surface-sensitive techniques such as ARPES and STM, with no signatures observed in bulk thermodynamic measurements. However, doped polycrystalline samples show bulk superconductivity. In this work, we investigate how chemical doping modifies this behaviour by studying PtBi(2−x)Ax (A = Te, Pd) in single crystals. Introducing the dopants transforms the system from a surface-confined superconductor into a bulk superconductor. DC and AC susceptibility measurements reveal a clear superconducting transition between 2-2.4 K, with the transition temperature Tc strongly dependent on the dopant concentration. The emergence of bulk superconductivity suggests a doping-induced structural change from a non-centrosymmetric to a centrosymmetric phase, offering an intriguing route to tune the interplay between structure and superconductivity in γ-PtBi2. These results highlight the potential of doped γ-PtBi2 as a platform for exploring exotic superconducting states and understanding how topological surface states evolve into bulk superconductivity.
Keywords: Magnatism; Superconductivity; AC and DC suceptibility