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Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride
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Journal Article
Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride
2015
Overview
Tungsten ditelluride has attracted intense research interest due to the recent discovery of its large unsaturated magnetoresistance up to 60 T. Motivated by the presence of a small, sensitive Fermi surface of 5
d
electronic orbitals, we boost the electronic properties by applying a high pressure, and introduce superconductivity successfully. Superconductivity sharply appears at a pressure of 2.5 GPa, rapidly reaching a maximum critical temperature (
T
c
) of 7 K at around 16.8 GPa, followed by a monotonic decrease in
T
c
with increasing pressure, thereby exhibiting the typical dome-shaped superconducting phase. From theoretical calculations, we interpret the low-pressure region of the superconducting dome to an enrichment of the density of states at the Fermi level and attribute the high-pressure decrease in
T
c
to possible structural instability. Thus, tungsten ditelluride may provide a new platform for our understanding of superconductivity phenomena in transition metal dichalcogenides.
Tungsten ditelluride has been recently discovered to possess very large and unsaturated magnetoresistance, up to 60 T. Here the authors apply high pressure on this material and observe a dome-shaped superconducting phase transition.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
