Enhanced Superconductivity in Restacked TaS2 Nanosheets.

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Abstract

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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Journal

Journal ID (iso-abbrev): J. Am. Chem. Soc.

Title: Journal of the American Chemical Society

Publisher: American Chemical Society (ACS)

ISSN (Electronic): 1520-5126

ISSN (Print): 0002-7863

Publication date (Electronic): Apr 05 2017

Volume: 139

Issue: 13

Affiliations

[1 ] State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, China.

[2 ] University of Chinese Academy of Sciences , Beijing 100049, China.

[3 ] 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.

[4 ] State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200030, China.

[5 ] State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences , Shanghai 200050, China.

[6 ] WPI Advanced Institute for Materials Research, Tohoku University , Sendai 980-8577, Japan.

Article

DOI: 10.1021/jacs.7b00216

PubMed ID: 28306256

SO-VID: 3494975d-1972-459c-a0fd-256660d1a7d8

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