Publication Date:
2016-04-21
Description:
Two-dimensional transition-metal dichalcogenide (TMDs) MoTe 2 has attracted much attention due to its predicted Weyl semimetal state and a quantum spin Hall insulator in bulk and monolayer form, respectively. We find that the superconductivity in MoTe 2 single crystal can be greatly enhanced by the partial substitution of the Te ions by the S ones. The maximum superconducting temperature T C of MoTe 1.8 S 0.2 single crystal is about 1.3 K. Compared with the parent MoTe 2 single crystal ( T C = 0.1 K), nearly 13-fold in T C is improved in the MoTe 1.8 S 0.2 one. The superconductivity has been investigated through the resistivity and magnetization measurements. MoTe 2−x S x single crystals belong to weak coupling superconductors and the improvement of the superconductivity may be related to the enhanced electron-phonon coupling induced by the S-ion substitution. A dome-shaped superconducting phase diagram is obtained in the S-doped MoTe 2 single crystals. MoTe 2−x S x materials may provide a new platform for our understanding of superconductivity phenomena and topological physics in TMDs.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
