Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: PtBi2
TT 11.1: Talk
Monday, March 9, 2026, 11:15–11:30, CHE/0091
Surface-confined fluctuating superconductivity in the topological semimetal γ-PtBi2 — •Manaswini Sahoo, Luminita Harnagea, Mahdi Behnami, Michele Ceccardi, Sebastian Gaß, Sabine Wurmehl, Anja UB Wolter, and Bernd Büchner — Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany
PtBi2 has recently emerged as a promising candidate for hosting superconducting topological surface states. While surface-sensitive probes have observed this unique superconductivity, it remains elusive in bulk thermodynamic measurements. Here, we present evidence of superconducting fluctuations at elevated temperatures through AC susceptibility measurements. The real component of the susceptibility exhibits a diamagnetic response below 20 K, accompanied by a finite imaginary component, both indicative of surface-confined superconducting fluctuations. The small superconducting volume fraction supports a surface rather than bulk origin. Complementary magnetoresistance measurements reveal anomalies below this characteristic temperature. These findings establish PtBi2 as a robust platform for exploring topological superconductivity and provide strong motivation for future studies aimed at elucidating the superconducting bulk-surface interplay.
Keywords: AC susceptibility; Superconductivity; Surface superconductivity; weyl semimetal; topological surface states