Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 68: Superconductivity: Properties and Electronic Structure
TT 68.7: Talk
Thursday, March 21, 2024, 11:00–11:15, H 3010
Tunneling spectroscopy on hybrid superconductor-ferromagnet bilayers made of non-centrosymmetric NbRe and Co — •Marcel Strohmeier1, Carla Cirillo2, Carmine Attanasio3, Angelo Di Bernardo1,3, and Elke Scheer1 — 1Universität Konstanz, Fachbereich Physik, 78464 Konstanz, Germany — 2CNR-SPIN, c/o Università degli Studi di Salerno, 84084 Fisciano (Sa), Italy — 3Dipartimento di Fisica ’E.R. Caianiello’, Università degli Studi di 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-like spin-orbit coupling a mixed spin-singlet and spin-triplet pairing state is predicted for these materials. In our talk we focus on polycrystalline non-centrosymmetric Nb0.18Re0.82. Studies on the upper critical field of thin-film micrometric strips have shown that the Pauli-contribution might play a minor role in terms of the underlying pair breaking mechanism. In addition, FMR measurements on NbRe/Co/NbRe trilayers suggest that the observed Gilbert damping can be explained by assuming a spin-pumping scenario across a spin-triplet S-F-S interface. However, the SC order parameter of NbRe is still under debate. We present first low-temperature scanning tunneling spectroscopy measurements on pure NbRe as well as NbRe/Co bilayers fabricated by magnetron sputtering. With a high spatial and energy resolution we probe the LDOS for different film thicknesses to get insights into the intrinsic pairing symmetry of the superconductor.
Keywords: non-centrosymmetric; superconductor; tunneling spectroscopy; unconventional superconductivity