Evolution of the Structural Transition in Mo1-xWxTe2

Published

August 24, 2020

Author(s)

John A. Schneeloch, Yu Tao, Chunruo Duan, Masaaki Matsuda, Adam A. Aczel, Jaime A. Fernandez-Baca, Guangyong Xu, Jorg C. Neuefeind, Junjie Yang, Despina Louca

Abstract

The composition dependence of the structural transition between the monoclinic 1T′ and orthorhombic T_d phases in the Mo_1-xW_xTe₂ Weyl semimetal was investigated by elastic neutron scattering on single crystals up to x ≅ 0:54. First observed in MoTe₂, the transition from T_d to 1T′ is accompanied by an intermediate pseudo-orthorhombic phase, T_d. Upon doping with W the T_d phase vanishes by x ≅ 0:34. Above this concentration, a phase coexistence behavior with both T_d and 1T′ is observed, instead. The interlayer in-plane positioning parameter, δ, which relates to the 1T′ β angle, decreases with temperature as well as with W substitution indicating strong anharmonicity of the layer displacements. The temperature width of the phase coexistence remains almost constant up to x ≅ 0:54, in contrast to the broadening reported with applying pressure.

Citation

Physical Review B

Volume

102

Issue

5

Pub Type

Journals

Download Paper

DOI Link

Keywords

Weyl Semimetal, neutron scattering, pressure

Citation

Schneeloch, J. , Tao, Y. , Duan, C. , Matsuda, M. , Aczel, A. , Fernandez-Baca, J. , Xu, G. , Neuefeind, J. , Yang, J. and Louca, D. (2020), Evolution of the Structural Transition in Mo_1-xW_xTe₂, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.102.054105 (Accessed April 26, 2024)