| Autor: |
C A Marques, M J Neat, C M Yim, M D Watson, L C Rhodes, C Heil, K S Pervakov, V A Vlasenko, V M Pudalov, A V Muratov, T K Kim, P Wahl |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 22, Iss 6, p 063049 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/ab890a |
| Popis: |
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 Sn _4 As _3 , with non-centrosymmetric unit cell ( R 3 m ). We have characterised the normal and superconducting states 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 T _c ∼ 1.14 K and an upper critical magnetic field of μ _0 H _c ≳ 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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