Observation of superconductivity in the pressurized Weyl-semimetal candidate TaIrTe4

Cai, Shu; Emmanouilidou, Eve; Guo, Jing; Li, Xiaodong; Li, Yanchun; Yang, Ke; Li, Aiguo; Wu, Qi; Ni, Ni; Sun, Liling

doi:10.1103/physrevb.99.020503

Observation of superconductivity in the pressurized Weyl-semimetal candidate TaIrTe₄

Journal Article · Tue Jan 08 23:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.020503· OSTI ID:1611721

Cai, Shu ^[1]; Emmanouilidou, Eve ^[2]; Guo, Jing ^[3]; Li, Xiaodong ^[3]; Li, Yanchun ^[3]; Yang, Ke ^[4]; Li, Aiguo ^[4]; Wu, Qi ^[3]; Ni, Ni ^[2]; Sun, Liling ^[5]

Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); DOE/OSTI
Univ. of California, Los Angeles, CA (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences, Shanghai (China)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab., Guangdong (China)

We report the observation of superconductivity in the pressurized type-II Weyl semimetal (WSM) candidate TaIrTe₄ by means of complementary high-pressure transport and synchrotron x-ray diffraction measurements. We find that TaIrTe₄ shows superconductivity with transition temperature (TC) of 0.57 K at the pressure of ~23.8GPa. Then, the T_C value increases with pressure and reaches ~2.1K at 65.7 GPa. In situ high-pressure Hall coefficient (R_H) measurements at low temperatures demonstrate that the positive R_H increases with pressure until the critical pressure of the superconducting transition is reached, but starts to decrease upon further increasing pressure. Above the critical pressure, the positive magnetoresistance effect disappears simultaneously. Our high-pressure x-ray diffraction measurements reveal that at around the critical pressure, the lattice of the TaIrTe₄ sample is distorted and its volume is reduced by ~19.2%, the value of which is predicted to result in the change of the electronic structure significantly. Furthermore, we propose that the pressure-induced distortion in TaIrTe4 is responsible for the change of topology of the Fermi surface, and such a change favors the emergence of superconductivity. Our results reveal the correlation among the lattice distortion, topological physics, and superconductivity in the WSM, a hot topic in condensed-matter physics.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0011978

OSTI ID:: 1611721

Alternate ID(s):: OSTI ID: 1490150

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 99; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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