Td to 1T′ structural phase transition in the WTe2 Weyl semimetal

Elastic neutron scattering on a single crystal combined with powder x-ray diffraction measurements were carried out to investigate how the crystal structure evolves as a function of temperature in the Weyl semimetal WTe2. A sharp transition from the low-temperature orthorhombic phase (Td) to the hig...

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Bibliographic Details
Published in:Physical review. B 2020-08, Vol.102 (6), p.1
Main Authors: Tao, Yu, Schneeloch, John A, Aczel, Adam A, Louca, Despina
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Crystal structure
Elastic scattering
High temperature
Low temperature
Neutron scattering
Orthorhombic phase
Phase transitions
Pressure
Single crystals
Structural phase transition
Weyl semimetal
X ray powder diffraction
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Summary:Elastic neutron scattering on a single crystal combined with powder x-ray diffraction measurements were carried out to investigate how the crystal structure evolves as a function of temperature in the Weyl semimetal WTe2. A sharp transition from the low-temperature orthorhombic phase (Td) to the high-temperature monoclinic phase (1T′) was observed at ambient pressure in the single crystal near ∼565 K. Unlike in MoTe2, the solid-solid transition from Td to 1T′ occurs without the cell doubling of the intermediate Td* phase with AABB (or ABBA) layer stacking. In powders, however, the thermal transition from the Td to the 1T′ phase was broadened and a two-phase coexistence was observed until 700 K, well above the structural transition.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.060103