Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Superconductivity: Poster Session
TT 19.34: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Scanning tunneling spectroscopy to probe odd-triplet contributions to the long-ranged proximity effect in Al-EuS — •Simon Diesch1, Christoph Sürgers2, Detlef Beckmann2, Peter Machon1, Wolfgang Belzig1, and Elke Scheer1 — 1Universität Konstanz, Konstanz, Germany — 2Karlsruhe Institute of Technology, Karlsruhe, Germany
Experiments on superconductor-ferromagnet-systems have shown Cooper pairs tunneling through ferromagnetic layers, indicating Cooper pairs of equal spin, thus corresponding to a long-range triplet proximity effect [1]. Most experimental evidence for triplet superconductivity comes from observations of the thickness dependence of the Josephson current through a ferromagnetic barrier, but there is an increasing interest in obtaining direct spectroscopic evidence [2].
This project aims to analyze the DOS of thin films of the ferromagnetic insulator europium sulfide on superconducting aluminum or vice versa, using a scanning tunneling microscope in spectroscopy mode at 280 mK and in varying magnetic fields. We observe significant broadening of the superconducting energy gap and a variety of sub-gap structures induced by the presence of the ferromagnet and interpret our findings based on the diffusive theory [3,4]
[1] F. S. Bergeret, PRL 86, 4096 (2001)
[2] F. Hübler, PRL 109, 87004 (2012)
[3] P. Machon, PRL 110, 047002 (2013)
[4] J. Linder, PRB 81, 214504 (2010)