Superconductivity emerging from a suppressed large magnetoresistant state in tungsten ditelluride

Defen Kang, Yazhou Zhou, Wei Yi, Chongli Yang, Jing Guo, Youguo Shi, Shan Zhang, Zhe Wang, Chao Zhang, Sheng Jiang, Aiguo Li, Ke Yang, Qi Wu, Guangming Zhang, Liling Sun () and Zhongxian Zhao ()
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Defen Kang: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Yazhou Zhou: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Wei Yi: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Chongli Yang: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Jing Guo: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Youguo Shi: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Shan Zhang: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Zhe Wang: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Chao Zhang: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Sheng Jiang: Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Aiguo Li: Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Ke Yang: Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Qi Wu: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Guangming Zhang: State Key Laboratory for Low dimensional Quantum Physics, Tsinghua University
Liling Sun: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences
Zhongxian Zhao: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences

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

Abstract: Abstract The recent discovery of large magnetoresistance in tungsten ditelluride provides a unique playground to find new phenomena and significant perspective for potential applications. The large magnetoresistance effect originates from a perfect balance of hole and electron carriers, which is sensitive to external pressure. Here we report the suppression of the large magnetoresistance and emergence of superconductivity in pressurized tungsten ditelluride via high-pressure synchrotron X-ray diffraction, electrical resistance, magnetoresistance and alternating current magnetic susceptibility measurements. Upon increasing pressure, the positive large magnetoresistance effect is gradually suppressed and turned off at a critical pressure of 10.5 GPa, where superconductivity accordingly emerges. No structural phase transition is observed under the pressure investigated. In situ high-pressure Hall coefficient measurements at low temperatures demonstrate that elevating pressure decreases the population of hole carriers but increases that of the electron ones. Significantly, at the critical pressure, a sign change of the Hall coefficient is observed.

Date: 2015
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DOI: 10.1038/ncomms8804

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