Surface-Limited Superconducting Phase Transition on 1T-TaS2

被引：68

作者：

Wang, Ziying ^{[1
]}

Sun, Yi-Yang ^{[2
]}

Abdelwahab, Ibrahim ^{[1
]}

Cao, Liang ^{[3
]}

Yu, Wei ^{[1
]}

Ju, Huanxin ^{[4
]}

Zhu, Junfa ^{[4
]}

Fu, Wei ^{[1
]}

Chu, Leiqiang ^{[1
]}

Xu, Hai ^{[1
,3
]}

Loh, Kian Ping ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Chem, Ctr Adv 2D Mat, Singapore 117543, Singapore

[2] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 201899, Peoples R China

[3] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Jilin, Peoples R China

[4] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Anhui, Peoples R China

来源：

ACS NANO | 2018年 / 12卷 / 12期

基金：

中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

2D materials; TaS2; superconducting; surface phase transition; charge density wave; CHARGE-DENSITY WAVES; SCANNING-TUNNELING-MICROSCOPY; MOTT-INSULATING STATE; ENHANCED SUPERCONDUCTIVITY; ELECTRONIC-STRUCTURES; CRITICAL FIELD; MONOLAYER; 2H-TAS2; 2H-NBSE2; 4HB-TAS2;

D O I：

10.1021/acsnano.8b07379

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Controlling superconducting phase transition on a two-dimensional (2D) material is of great fundamental and technological interest from the viewpoint of making 2D resistance-free electronic circuits. Here, we demonstrate that a 1T-to-2H phase transition can be induced on the topmost monolayer of bulk (<100 nm thick) 1T-TaS2 by thermal annealing. The monolayer 2H-TaS2 on bulk 1T-TaS2 exhibits a superconducting transition temperature (T-c) of 2.1 K, which is significantly enhanced compared to that of bulk 2H-TaS2. Scanning tunneling microscopy measurements reveal a 3 X 3 charge density wave (CDW) in the phase-switched monolayer at 4.5 K. The enhanced Tc is explained by the suppressed 3 X 3 CDW and a charge-transfer doping from the IT substrate. We further show that the monolayer 2H-TaS2 could be switched back to 1T phase by applying a voltage pulse. The observed surface-limited superconducting phase transition offers a convenient way to prepare robust 2D superconductivity on bulk 1T-TaS2 crystal, thereby bypassing the need to exfoliate monolayer samples.

引用

页码：12619 / 12628

页数：10

共 57 条

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