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High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity

Author

Listed:
  • K. Mukasa

    (University of Tokyo)

  • K. Matsuura

    (University of Tokyo)

  • M. Qiu

    (University of Tokyo)

  • M. Saito

    (University of Tokyo)

  • Y. Sugimura

    (University of Tokyo)

  • K. Ishida

    (University of Tokyo)

  • M. Otani

    (University of Tokyo)

  • Y. Onishi

    (University of Tokyo)

  • Y. Mizukami

    (University of Tokyo
    University of Tokyo)

  • K. Hashimoto

    (University of Tokyo
    University of Tokyo)

  • J. Gouchi

    (University of Tokyo)

  • R. Kumai

    (IMSS, KEK)

  • Y. Uwatoko

    (University of Tokyo)

  • T. Shibauchi

    (University of Tokyo
    University of Tokyo)

Abstract

The interplay among magnetism, electronic nematicity, and superconductivity is the key issue in strongly correlated materials including iron-based, cuprate, and heavy-fermion superconductors. Magnetic fluctuations have been widely discussed as a pairing mechanism of unconventional superconductivity, but recent theory predicts that quantum fluctuations of nematic order may also promote high-temperature superconductivity. This has been studied in FeSe1−xSx superconductors exhibiting nonmagnetic nematic and pressure-induced antiferromagnetic orders, but its abrupt suppression of superconductivity at the nematic end point leaves the nematic-fluctuation driven superconductivity unconfirmed. Here we report on systematic studies of high-pressure phase diagrams up to 8 GPa in high-quality single crystals of FeSe1−xTex. When Te composition x(Te) becomes larger than 0.1, the high-pressure magnetic order disappears, whereas the pressure-induced superconducting dome near the nematic end point is continuously found up to x(Te) ≈ 0.5. In contrast to FeSe1−xSx, enhanced superconductivity in FeSe1−xTex does not correlate with magnetism but with the suppression of nematicity, highlighting the paramount role of nonmagnetic nematic fluctuations for high-temperature superconductivity in this system.

Suggested Citation

  • K. Mukasa & K. Matsuura & M. Qiu & M. Saito & Y. Sugimura & K. Ishida & M. Otani & Y. Onishi & Y. Mizukami & K. Hashimoto & J. Gouchi & R. Kumai & Y. Uwatoko & T. Shibauchi, 2021. "High-pressure phase diagrams of FeSe1−xTex: correlation between suppressed nematicity and enhanced superconductivity," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20621-2
    DOI: 10.1038/s41467-020-20621-2
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    Cited by:

    1. M. Čulo & S. Licciardello & K. Ishida & K. Mukasa & J. Ayres & J. Buhot & Y.-T. Hsu & S. Imajo & M. W. Qiu & M. Saito & Y. Uezono & T. Otsuka & T. Watanabe & K. Kindo & T. Shibauchi & S. Kasahara & Y., 2023. "Expanded quantum vortex liquid regimes in the electron nematic superconductors FeSe1−xSx and FeSe1−xTex," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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