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Electronic structure and superconductivity of the non-centrosymmetric Sn4As3

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Marques_2020_NJP_Electronic_CC.pdf (2.490Mb)
Date
24/06/2020
Author
De Almeida Marques, Carolina
Neat, Matthew James
Yim, Chi Ming
Watson, Matthew David
Rhodes, Luke Charles
Heil, Christoph
Pervakov, Kirill
Vlasenko, Vladimir
Pudalov, Vladimir
Muratov, Andrei
Kim, Timur
Wahl, Peter
Funder
EPSRC
EPSRC
Grant ID
EP/L015110/1
EP/S005005/1
Keywords
Non-centrosymmetric
Superconductivity
Sn4As3
Scanning tunneling microscopy and spectroscopy
Angle-resolved photoemission spectroscopy
QC Physics
DAS
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Abstract
In a superconductor that lacks inversion symmetry, the spatial part of the Cooper pair wave function has a reduced symmetry, allowing for the mixing of spin-singlet and spin-triplet Cooper pairing channels and thus providing a pathway to a non-trivial superconducting state. Materials with a non-centrosymmetric crystal structure and with strong spin-orbit coupling are a platform to realize these possibilities. Here, we report the synthesis and characterisation of high quality crystals of Sn4As3, with non-centrosymmetric unit cell (R3m). We have characterised the normal and superconducting state using a range of methods. Angle-resolved photoemission spectroscopy shows a multiband Fermi surface and the presence of two surface states, confirmed by Density-functional theory calculations. Specific heat measurements reveal a superconducting critical temperature of Tc ∼ 1.14 K and an upper critical magnetic field of Hc ≈ 7 mT, which are both confirmed by ultra-low temperature scanning tunneling microscopy and spectroscopy. Scanning tunneling spectroscopy shows a fully formed superconducting gap, consistent with conventional s-wave superconductivity.
Citation
De Almeida Marques , C , Neat , M J , Yim , C M , Watson , M D , Rhodes , L C , Heil , C , Pervakov , K , Vlasenko , V , Pudalov , V , Muratov , A , Kim , T & Wahl , P 2020 , ' Electronic structure and superconductivity of the non-centrosymmetric Sn 4 As 3 ' , New Journal of Physics , vol. 22 , 063049 . https://doi.org/10.1088/1367-2630/ab890a
Publication
New Journal of Physics
Status
Peer reviewed
DOI
https://doi.org/10.1088/1367-2630/ab890a
ISSN
1367-2630
Type
Journal article
Rights
Copyright © 2020 The Author(s). Open Access article. Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Description
CAM and MJN acknowledge studentship funding from EPSRC under Grant no. EP/L015110/1. CMY and PW acknowledge funding through EP/S005005/1. CH acknowledges support by the Austrian Science Fund (FWF) Project No. P32144-N36 and the VSC-3 of the Vienna University of Technology. KSP, VAV, VMP, and AVM acknowledge support of the state assignment of the Ministry of Science and Higher Education of the Russian Federation (Project No. 0023-2019-0005).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/20163

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