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Pressure-driven dome-shaped superconductivity and electronic structural evolution in tungsten ditelluride

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arxiv 1501.07394 v3 pith:QF73SK7Y submitted 2015-01-29 cond-mat.supr-con cond-mat.str-el

Xing-Chen Pan , Xuliang Chen , Huimei Liu , Yanqing Feng , Zhongxia Wei , Yonghui Zhou , Zhenhua Chi , Li Pi
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Fei Yen Fengqi Song Xiangang Wan Zhaorong Yang Baigeng Wang Guanghou Wang Yuheng Zhang
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classification cond-mat.supr-concond-mat.str-el
keywords superconductivityditellurideelectronicpressuretungstendecreasedome-shapedfermi
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Tungsten ditelluride has attracted intense research interest due to the recent discovery of its large unsaturated magnetoresistance up to 60 Tesla. Motivated by the presence of a small, sensitive Fermi surface of 5d 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 (Tc) of 7 K at around 16.8 GPa, followed by a monotonic decrease in Tc 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 Tc to possible structural instability. Thus, Tungsten ditelluride may provide a new platform for our understanding of superconductivity phenomena in transition metal dichalcogenides.

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  1. Understanding the origin of superconducting dome in electron-doped MoS$_2$ monolayer

    cond-mat.supr-con 2024-12 conditional novelty 6.0 of 10

    The superconducting dome in electron-doped MoS2 is recreated from first principles and traced to the 1x1 H to 2x2 charge-density-wave transition and later structural phases.

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