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Condens. Matter 2019, 4(1), 9; https://doi.org/10.3390/condmat4010009

Proximity-Induced Superconducting States of Magnetically Doped 3D Topological Insulators with High Bulk Insulation

1
Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2
Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
3
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
Current address: National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0003, Japan.
*
Author to whom correspondence should be addressed.
Received: 25 November 2018 / Revised: 22 December 2018 / Accepted: 7 January 2019 / Published: 12 January 2019
(This article belongs to the Special Issue Majorana Fermions and Topological Materials Science)
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Abstract

We studied magnetized topological insulator/superconductor junctions with the expectation of unconventional superconductive states holding Majorana fermions induced by superconductive proximity effects on the surface states of magnetized topological insulators (TIs), attached by conventional superconductors. We introduced Fe-doped BiSbTe2Se as an ideal magnetic TI and used the developed junction fabrication process to access the proximity-induced surface superconducting states. The bulk single crystals of the Fe-doped TI showed excellent bulk-insulating properties and ferromagnetism simultaneously at a low temperature. Meanwhile, the fabricated junctions also showed an insulating behavior above 100 K, as well as metallic conduction at a low temperature, which reflects bulk carrier freezing. In addition, we observed a proximity-induced gap structure in the conductance spectra. These results indicate that the junctions using the established materials and process are preferable to observe unconventional superconducting states which are induced via the surface channels of the magnetized TI. We believe that the developed process can be applied for the fabrication of complicated junctions and suites for braiding operations. View Full-Text
Keywords: unconventional superconducting states; magnetized topological insulators; proximity effects; crystal growth; junction fabrication process unconventional superconducting states; magnetized topological insulators; proximity effects; crystal growth; junction fabrication process
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Yano, R.; Hirose, H.T.; Tsumura, K.; Yamamoto, S.; Koyanagi, M.; Kanou, M.; Kashiwaya, H.; Sasagawa, T.; Kashiwaya, S. Proximity-Induced Superconducting States of Magnetically Doped 3D Topological Insulators with High Bulk Insulation. Condens. Matter 2019, 4, 9.

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