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DESCRIPTION:Yu Tao\, University of Virginia - Department of Physics\n\n
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span style="font-size:16px">
Mo1-xWxTe2 belongs to the family of layer
ed transition metal dichalcogenides (TMD) that are of intense interest rec
ently because of their fascinating topological properties. The end members
of this series\, MoTe2 and WTe2 are Weyl semimetals
upon cooling to the orthorhombic Td phase. Mo1-xWxT
e2 undergoes a structural phase transition from a high-temperat
ure monoclinic 1T'\; phase\, to a non-centrosymmetric orthorhombic Td phase at low temperatures through a first-order structural phase
transition. Both 1T'\; and Td phases are comprised of weakl
y-bound layers\, and differ mainly by shifts of the layers along the c-axi
s. Despite much research\, the structural properties of Mo1-xW<
sub>xTe2 have not been thoroughly investigated. Neutron s
cattering experiments at the High Flux Isotope Reactor (HFIR) at Oak Ridge
National Laboratory were carried out on single crystals of Mo1-xWxTe2. Structural changes including changes in int
erlayer disorder were observed by focusing on the elastic scattering along
(2\, 0\, L) on cooling and warming through the hysteresis loop at the tra
nsition. A Td* phase was discovered for the first time across t
he Td-1T&rsquo\; phase boundary in Mo1-xWxTe2 with x up to ~0.2. In WTe2\, a sharp transition
from Td to 1T&prime\; was observed at ambient pressure in the
single crystal near &sim\;565 K\, the transition proceeds without hysteres
is. These results should clarify in microscopic detail the nature of these
phase transitions.
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DTSTART:20200326T150000Z
LOCATION:Online\, Room via Zoom (Zoom link and meeting ID provided above)
SUMMARY:Investigation of the structural phase transitions in Weyl semimetal
(Mo\, W)Te2
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