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TT: Fachverband Tiefe Temperaturen
TT 32: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics
TT 32.5: Vortrag
Mittwoch, 19. März 2025, 16:00–16:15, H32
Experimental Signal of Multiple Andreev Reflexion in Spin Splitted Tunneling Junctions — •David Caldevilla-Asenjo1, Sara Catalano2,3, Pietro Cattaneo4, Fernando Sebastian Bergeret1, Maxim Ilyn1, and Celia Rogero1 — 1Centro de Fisica de Materiales (CSIC-UPV/EHU),20018 Donostia San Sebastian — 2Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5,20018 Donostia, Spain. — 3IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Basque Country, Spain. — 4Politecnico di Milano, 20133, Milano, Italy
A ferromagnetic insulator in contact with a superconductor induces an effective exchange field, resulting in a spin splitting of the BCS density of states [1,2]. In this work, we study planar Josephson Junctions where one electrode is in contact with a thin layer of the ferromagnetic insulator europium sulfide. Samples are grown in situ by using the hard-mask technique in UHV. We characterized the junctions through DC transport measurements at a base temperature of 10mK, observing Josephson coupling and Multiple Andreev Reflection according to the transparency of the barrier. We propose a theory model to interpret the junction spectra taking into account the exchange field. Our results provide an experimental and theoretical description of ingap transport processes in superconducting junctions proximitized by a ferromagnetic insulator [3].
[1] R. Meservey and P.M. Tedrow, Phys. Rep. 238, 173 (1994);
[2] A. Hijano et al., Phys. Rev. Res. 3, 021031 (2021);
[3] B. Lu et al., Phys. Rev. B 101, 020502 (2020).
Keywords: Multiple Andreev Reflexion; Spin Splitting; Exchange field