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

Xing-Chen Pan, Xuliang Chen, Huimei Liu, Yanqing Feng, Zhongxia Wei, Yonghui Zhou, Zhenhua Chi, Li Pi, Fei Yen, Fengqi Song (), Xiangang Wan (), Zhaorong Yang (), Baigeng Wang, Guanghou Wang and Yuheng Zhang
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Xing-Chen Pan: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Xuliang Chen: Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Huimei Liu: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Yanqing Feng: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Zhongxia Wei: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Yonghui Zhou: Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Zhenhua Chi: Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Li Pi: Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Fei Yen: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences
Fengqi Song: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Xiangang Wan: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Zhaorong Yang: Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Baigeng Wang: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Guanghou Wang: National Laboratory of Solid State Microstructures, College of Physics, Nanjing University
Yuheng Zhang: Collaborative Innovation Center of Advanced Microstructures, Nanjing University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract 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 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.

Date: 2015
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DOI: 10.1038/ncomms8805

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