Volume 132, Number 6, December 2020
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||01 March 2021|
Magnetically stable zero-bias anomaly in Andreev contact to the magnetic Weyl semimetal Co3Sn2S2
Institute of Solid State Physics of the Russian Academy of Sciences - 2 Academician Ossipyan str., 142432 Chernogolovka, Moscow District, Russia
Received: 4 August 2020
Accepted: 13 November 2020
Being encouraged by the interplay between topology, superconductivity and magnetism, we experimentally investigate charge transport through the interface between the Nb superconductor and the time-reversal symmetry breaking Weyl semimetal Co3Sn2S2. In addition to the proximity-induced superconducting gap, we observe prominent subgap zero-bias anomaly. The anomaly demonstrates an unusual robustness to external magnetic fields: its width is absolutely stable up to the critical field of Nb, while its amplitude exhibits a weak non-monotonous variation. As the promising scenario of emergence of the zero-bias anomaly in transport characteristics, we consider the proximity-induced zero-energy Andreev bound states interfaced with the half-metallic Co3Sn2S2 and influenced by the strong spin-orbit coupling and large Zeeman splitting.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 73.40.-c – Electronic transport in interface structures
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