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Enhanced Superconductivity in Restacked TaS2 Nanosheets

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† State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
‡ University of Chinese Academy of Sciences, Beijing 100049, China
§ State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
∥ State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
⊥ WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
# State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
*[email protected]
*[email protected]
Cite this: J. Am. Chem. Soc. 2017, 139, 13, 4623–4626
Publication Date (Web):March 17, 2017
https://doi.org/10.1021/jacs.7b00216
Copyright © 2017 American Chemical Society
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Abstract

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Since interface superconductivity was discovered at the interface between two insulating layers LaAlO3 and SrTiO3, such interface-induced superconducting systems have been a research hotspot in superconductivity. Here, we report homogeneous interfaces formed by stacking chemically exfoliated monolayer TaS2 nanosheets randomly. Enhanced superconductivity of Tc = 3 K is observed, compared with 0.8 K of parent 2H-TaS2. The measurement of heat capacity shows the increase of electronic specific-heat coefficient γ of restacked TaS2 nanosheets compared to parent 2H-TaS2 crystals. Density functional theory calculations indicate that increase and delocalization of electron states near the Fermi surface due to the homogeneous interfaces effects could account for the enhanced superconductivity.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/jacs.7b00216.

  • PXRD patterns of as-prepared 2H-TaS2 and LixTaS2 polycrystalline powders; schematic illustration of lithium-deintercalation exfoliation for preparation of monolayer TaS2 nanosheets; Raman spectrum of bulk 2H-TaS2, monolayer TaS2 and restacked TaS2 nanosheets; HAADF STEM image of restacked TaS2 nanosheets; temperature dependence of magnetic susceptibility of freeze-dried exfoliated monolayer TaS2 powders; relationship between superconducting temperature and critical magnetic field; details of DFT calculation for twisted 2H-TaS2 structures (PDF)

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