Proximity-Induced Superconductivity and Quantum Interference in Topological 
Crystalline Insulator SnTe Thin-Film Devices

Klett, Robin; Schonle, Joachim; Becker, Andreas; Dyck, Denis; Borisov, Kiril; Rott, Karsten; Ramermann, Daniela; Bueker, Bjoern; Haskenhoff, Jan; Krieft, Jan; Huebner, Torsten; Reimer, Oliver; Shekhar, Chandra; Schmalhorst, Jan-Michael; Huetten, Andreas; Felser, Claudia; Wernsdorfer, Wolfgang; Reiss, Guenter

doi:10.1021/acs.nanolett.7b04870

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Proximity-Induced Superconductivity and Quantum Interference in Topological Crystalline Insulator SnTe Thin-Film Devices

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Shekhar, Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Klett, R., Schonle, J., Becker, A., Dyck, D., Borisov, K., Rott, K., et al. (2018). Proximity-Induced Superconductivity and Quantum Interference in Topological Crystalline Insulator SnTe Thin-Film Devices. Nano Letters, 18(2), 1264-1268. doi:10.1021/acs.nanolett.7b04870.

Cite as: https://hdl.handle.net/21.11116/0000-0000-DD09-E

Abstract

Topological crystalline insulators represent a new state of matter, in which the electronic transport is governed by mirror-symmetry protected Dirac surface states. Due to the helical spin-polarization of these surface states, the proximity of topological crystalline matter to a nearby superconductor is predicted to induce unconventional superconductivity and, thus, to host Majorana physics. We report on the preparation and characterization of Nb-based superconducting quantum interference devices patterned on top of topological crystalline insulator SnTe thin films. The SnTe films show weak anti-localization, and the weak links of the superconducting quantum interference devices (SQUID) exhibit fully gapped proximity-induced superconductivity. Both properties give a coinciding coherence length of 120 nm. The SQUID oscillations induced by a magnetic field show 2 pi periodicity, possibly dominated by the bulk conductivity.