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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Supercurrent Diode Effect
TT 25.8: Vortrag
Mittwoch, 19. März 2025, 11:30–11:45, H32
Investigation of Josephson junctions with Weyl-Kondo semimetals — •Ronja Fischer-Süßlin1, Roman Hartmann1, Thành Tran1, Diana Kirschbaum2, Xinlin Yan2, Andrey Prokofiev2, Angelo Di Bernardo1,3, Silke Paschen2, and Elke Scheer1 — 1FB Physik, Universität Konstanz, Konstanz, Deutschland — 2Institut für Festkörperphysik, TU Wien, Wien, Österreich — 3Dipartimento di Fisica, Università di Salerno, Fisciano, Italy
A superconducting diode, i.e., a device with a polarity dependent supercurrent amplitude, would provide new functionalities for superconducting circuits. The superconducting diode effect (SDE) was observed in 2020 [1] in an artificial superlattice with inversion symmetry breaking and is now investigated in both Josephson junctions and junction-free superconductors. We have fabricated and investigated Josephson junctions composed of Nb electrodes and the Ce-based Weyl-Kondo semimetals Ce3Bi4Pd3 [2] and CeRu4Sn6 [3] as weak links. These topologically nontrivial materials are promising candidates to investigate the SDE due to their noncentrosymmetry and strong spin-orbit coupling, which are also responsible for the purely electric-field-driven nonlinear spontaneous Hall response [2,3].
[1] F. Ando et al., Nature 584, 373-376 (2020).
[2] S. Dzsaber et al., PNAS 118, e2013386118 (2021).
[3] D.Kirschbaum et al., arXiv:2404.15924 (2023).
Keywords: Superconducting diode; Josephson junction; CeRu4Sn6; Ce3Bi4Pd3; Weyl-Kondo semimetal