Abstract
Abstract
We report the discovery of superconductivity with T
c of about 5.3 K in a new misfit layered compound (SnSe)1.16(NbSe2)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(NbSe2).
Funder
the National Key R&D Projects of China
National Natural Science Foundation of China
Subject
Metals and Alloys,Polymers and Plastics,Surfaces, Coatings and Films,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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