Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Unconventional Superconductors
TT 24.6: Vortrag
Mittwoch, 19. März 2025, 11:00–11:15, H31
Tunneling spectroscopy on superconducting thin films of non-centrosymmetric niobium rhenium — •Marcel Strohmeier1, Carla Cirillo2, Andriy Smolyanyuk3, Karsten Held3, Carmine Attanasio4, Angelo Di Bernardo1,4, and Elke Scheer1 — 1Department of Physics, University of Konstanz, 78457 Konstanz, Germany — 2CNR-Spin, c/o University of Salerno, 84084 Fisciano (SA), Italy — 3Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria — 4Department of Physics ’E.R. Caianiello’, University of Salerno, 84084 Fisciano (SA), Italy
In recent years, non-centrosymmetric superconductors have attracted increasing attention as they reveal various properties of unconventional superconductivity. With the absence of inversion symmetry and an asymmetric Rashba-type spin-orbit coupling (SOC) a mixed spin-singlet and spin-triplet pairing state is predicted in these materials. In our talk, we focus on the non-centrosymmetric compound Nb0.18Re0.82, whose superconducting order parameter remains under debate. Its favorable combination of material properties such as structural disorder, strong SOC and relatively high critical current densities makes NbRe an promising candidate for applications in superconducting single-photon detection and gate-controlled supercurrent devices. We present low-temperature scanning tunneling microscopy measurements on polycrystalline NbRe fabricated by magnetron sputtering. Using high-energy resolution N-I-S spectroscopy, we probe the local density of states in thin films of varying thickness and crystallinity to gain insights into the intrinsic pairing symmetry of the superconductor.
Keywords: Non-centrosymmetric; Superconductor; Tunneling spectroscopy; Unconventional superconductivity