Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Superconductivity: Sample Preparation and Characterization
TT 5.4: Vortrag
Montag, 9. März 2026, 10:15–10:30, CHE/0089
Tuning Superconductivity and Vortex Dynamics in NbRe Films via Grain-Size Control — •Zahra Makhdoumi Kakhaki1, Francesco Avitabile2, Abhishek Kumar2, Francesco Colangelo2, Carla Cirillo3, Carmine Attanasio2, and Oleksandr Dobrovolskiy1 — 1Cryogenic Quantum Electronics, EMG and LENA, Technische Universität Braunschweig, Germany — 2Università degli Studi di Salerno, Italy — 3CNR-SPIN, Università di Salerno, Italy
NbRe, a non-centrosymmetric superconductor with strong antisymmetric spin-orbit coupling and relatively high Tc, is of interest for superconducting spintronics and single-photon detectors. Yet, it poses a challenge: understanding how its order parameter evolves in thin films as crystallite size changes. Here, we induce a significant structural transformation in 20 nm-thick NbRe films through thermal an-nealing, increasing the average crystallite size from about 2 nm to approximately 8 nm across as-grown and annealed conditions [1]. We probe superconducting pairing via upper critical field measurements and quantify vortex dynamics through current-voltage curves under varying temperatures and magnetic fields. The annealed films exhibit discrete resistive states and traces of normal-conducting domains at-
tributed to dissipative vortex motion and local overheating [2]. In addi- tion to spin-triplet correlations in NbRe-based hybrids [3], the annealed films show indications of two superconducting gaps.
[1] Makhdoumi Kakhaki et al., SUST 37 (2024) 125002
[2] Bezuglyj et al., PRB 99 (2019) 174518
[3] Colangelo et al., PRL (2025), arXiv:2510.08110
Keywords: NbRe thin films; Upper critical field; Crystallite size; Spin-orbit coupling; Vortex dynamics