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TT: Fachverband Tiefe Temperaturen
TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure
TT 2.3: Vortrag
Montag, 16. März 2020, 10:00–10:15, HSZ 103
Investigating the proximity effects in chiral molecules on conventional superconductors — Hen Alpern1, •Roman Hartmann2, Nir Sukenik1, Shira Yochelis1, Itai Keren1, Hadar Steinberg1, Zaher Salman3, Elke Scheer2, Yossi Paltiel1, Oded Milo1, and Angelo Di Bernardo2 — 1Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 91904 Israel — 2Fachbereich Physik, Universität Konstanz, 78464 Konstanz, Germany — 3Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Superconducting spintronics is emerging as an alternative technology that can overcome the main limitations of conventional spintronic devices related to their high current dissipations. It has developed after the recent discovery that Cooper pairs with parallel-aligned spins (spin-triplets) can be generated at the interface between a conventional superconductor (S) and a magnetically inhomogeneous ferromagnet (F). More recently, by performing low-temperature STM measurements of the density of states of chiral molecules (ChMs) adsorbed on the surface of a Nb (S) thin film, we have observed subgap features due to spin-triplet states in such system, without an F layer. Based on these results, we have carried out low-energy muon spectroscopy on ChMs/Nb demonstrating evidence for an inverse (paramagnetic) Meissner state meaning an increase in the local field above the applied field in the superconducting state, with an amplitude variation depending on the Nb thickness. This provides spectroscopic evidence for spin-triplet pairing in ChMs/Nb and paves the way for novel superconducting devices.