In:
Materials Research Express, IOP Publishing, Vol. 7, No. 1 ( 2020-01-01), p. 016002-
Abstract:
We report the discovery of superconductivity with T c of about 5.3 K in a new misfit layered compound (SnSe) 1.16 (NbSe 2 ) 2 . High resolution transmission electron microscopy and selected area electron diffraction of the single-crystalline samples clearly reveal the misfit layered structure. Based on the McMillan equation, the electron-phonon coupling constant λ e – ph is estimated to be about 0.96, which is close to strong coupling range. The estimated out-of-plane and in-plane upper critical magnetic fields are 8.9 T and 15.5 T respectively. H c 2 ab (0) is 1.74 times the value of Pauli paramagnetic limit. Moreover, there is a positive curvature in the H c 2 ( T ) curves near T c , indicating a feature of multi-band superconductivity. The temperature dependence of specific-heat in superconducting state can be fit by a two-band BCS model, which confirms further the multi-band superconductivity. The reduced charge transfer between the two subsystems may account for the enhanced T c comparing with (SnSe) 1.16 (NbSe 2 ).
Type of Medium:
Online Resource
ISSN:
2053-1591
DOI:
10.1088/2053-1591/ab60a8
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2020
detail.hit.zdb_id:
2760382-9
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