Surface-Limited Superconducting Phase Transition on 1 T-TaS2.
ACS Nano
; 12(12): 12619-12628, 2018 Dec 26.
Article
em En
| MEDLINE
| ID: mdl-30403840
ABSTRACT
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 1 T-to-2 H phase transition can be induced on the topmost monolayer of bulk (<100 nm thick) 1 T-TaS2 by thermal annealing. The monolayer 2 H-TaS2 on bulk 1 T-TaS2 exhibits a superconducting transition temperature ( Tc) of 2.1 K, which is significantly enhanced compared to that of bulk 2 H-TaS2. Scanning tunneling microscopy measurements reveal a 3 × 3 charge density wave (CDW) in the phase-switched monolayer at 4.5 K. The enhanced Tc is explained by the suppressed 3 × 3 CDW and a charge-transfer doping from the 1 T substrate. We further show that the monolayer 2 H-TaS2 could be switched back to 1 T phase by applying a voltage pulse. The observed surface-limited superconducting phase transition offers a convenient way to prepare robust 2D superconductivity on bulk 1 T-TaS2 crystal, thereby bypassing the need to exfoliate monolayer samples.
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MEDLINE
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En
Ano de publicação:
2018
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Article