Volume 128, Number 1, October 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 November 2019|
Enhanced superconductivity in a misfit compound (PbSe)1.12 (TaSe2)2 with double TaSe2 layers
1 Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University Hangzhou 310027, PRC
2 State Key Laboratory of Silicon Materials, Zhejiang University - Hangzhou 310027, PRC
3 School of Materials Science and Engineering, Zhejiang University - Hangzhou 310027, PRC
4 Zhejiang California International NanoSystems Institute, Zhejiang University - Hangzhou 310058, PRC
Received: 13 July 2019
Accepted: 6 October 2019
We report the discovery of superconductivity with a maximum Tc ≈ 1.85 K in a new misfit layered compound , which consists of alternating layers of a distorted rocksalt layer PbSe and a double-layer dichalcogenide . A large anisotropic parameter of resistivity and that of the upper critical field = are obtained. The estimated c-axis coherence length is comparable to the c-axis lattice constant. Moreover, the estimated upper critical field , significantly exceeding the Pauli paramagnetic limit. All these data indicate a quasi-two-dimensional nature of the superconducting properties in . Compared with the physical properties of the misfit compound superconductor with only the half-layer of the unit, our study suggests that the enhancement of Tc in with double TaSe2 layers is presumably related to the increase in hole carrier density. The reduced charge transfer from the PbSe layer to the conducting TaSe2 layer could account for the variation in the charge carrier density.
PACS: 74.78.Fk – Multilayers, superlattices, heterostructures / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
© EPLA, 2019
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