Reentrant Proximity-Induced Superconductivity for GeTe Semimetal

We experimentally investigate charge transport in In–GeTe and In–GeTe–In proximity devices, which are formed as junctions between superconducting indium leads and thick single crystal flakes of α-GeTe topological semimetal. We observe nonmonotonic effects of the applied external magnetic field, incl...

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Bibliographic Details
Published in:JETP letters 2023-12, Vol.118 (11), p.847-854
Main Authors: Esin, V. D., Kazmin, D. Yu, Barash, Yu. S., Timonina, A. V., Kolesnikov, N. N., Deviatov, E. V.
Format: Article
Language:English
Subjects:
Atomic
Biological and Medical Physics
Biophysics
Charge transport
Condensed Matter
Electrons
Fields (mathematics)
Heterostructures
Josephson junctions
Magnetic fields
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Polarization (spin alignment)
Quantum Information Technology
Single crystals
Solid State Physics
Spin-orbit interactions
Spintronics
Superconductivity
Topology
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Summary:We experimentally investigate charge transport in In–GeTe and In–GeTe–In proximity devices, which are formed as junctions between superconducting indium leads and thick single crystal flakes of α-GeTe topological semimetal. We observe nonmonotonic effects of the applied external magnetic field, including reentrant superconductivity in In–GeTe–In Josephson junctions: supercurrent reappears at some finite magnetic field. For a single In–GeTe Andreev junction, the superconducting gap is partially suppressed in zero magnetic field, while the gap is increased nearly to the bulk value for some finite field before its full suppression. We discuss possible reasons for the results obtained, taking into account spin polarization of Fermi arc surface states in topological semimetal -GeTe with a strong spin–orbit coupling. In particular, the zero-field surface state spin polarization partially suppresses the superconductivity, while it is recovered due to the modified spin-split surface state configuration in finite fields. As an alternative possible scenario, the transition into the Fulde–Ferrell–Larkin–Ovchinnikov state is discussed. However, the role of strong spin–orbit coupling in forming the nonmonotonic behavior has not been analyzed for heterostructures in the Fulde–Ferrell–Larkin–Ovchinnikov state, which is crucial for junctions involving GeTe topological semimetal.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364023603329