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 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.
Originalsprache | englisch |
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Aufsatznummer | 063049 |
Seitenumfang | 11 |
Fachzeitschrift | New Journal of Physics |
Jahrgang | 22 |
Ausgabenummer | 6 |
DOIs | |
Publikationsstatus | Veröffentlicht - Juni 2020 |
ASJC Scopus subject areas
- Allgemeine Physik und Astronomie