Giant enhancement of superconductivity in few layers MoTe2*

Project supported by the Guangdong Innovative and Entrepreneurial Research Team Program, China (Grant No. 2016ZT06D348), the National Natural Science Foundation of China (Grant No. 11874193), and the Shenzhen Fundamental Subject Research Program, China (Grant Nos. JCYJ20170817110751776 and JCYJ20170307105434022).

Gan Yuan1, 2, Cho Chang-Woo2, Li Alei2, Lyu Jian2, Du Xu3, Wen Jin-Sheng1, Zhang Li-Yuan2, †
       

(a) Temperature dependence of the normalized resistance (R/R250 K) for MoTe2 crystals with thickness ranging from 4.0 nm to 9.3 nm, with inset showing low-temperature zoom-in of the normalized resistance (R/R10 K) as a function of temperature. (b) Superconducting phase transition temperature Tc as a function of sample thickness with Tc being defined as 90% and 60% of normal state resistance at 10 K, and the blue dotted line referring to bulk Tc,0 cited from Ref. [8]. (c) Electrical Hall resistivity data as a function of a magnetic field for various sample thickness values. (d) Carrier concentration and mobility (inset) at different sample thicknesses at 5 K, extracted from two-band model fit.