Enhanced Superconductivity in Restacked TaS2 Nanosheets

Jie Pan; Chenguang Guo; Changsheng Song; Xiaofang Lai; Hui Li; Wei Zhao; Hui Zhang; Gang Mu; Kejun Bu; Tianquan Lin; Xiaoming Xie; Mingwei Chen; Fuqiang Huang

doi:10.1021/jacs.7b00216

Enhanced Superconductivity in Restacked TaS₂ Nanosheets

J Am Chem Soc. 2017 Apr 5;139(13):4623-4626. doi: 10.1021/jacs.7b00216. Epub 2017 Mar 23.

Authors

Jie Pan^{1

2

3}, Chenguang Guo^{1

2

3}, Changsheng Song¹, Xiaofang Lai³, Hui Li⁴, Wei Zhao¹, Hui Zhang⁵, Gang Mu⁵, Kejun Bu^{1

2

3}, Tianquan Lin¹, Xiaoming Xie⁵, Mingwei Chen^{4

6}, Fuqiang Huang^{1

3}

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.

PMID: 28306256
DOI: 10.1021/jacs.7b00216

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 T_c = 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.

Publication types

Research Support, Non-U.S. Gov't