Nematic quantum-critical fluctuations near the pseudogap critical point in high-<i>T</i><sub>c</sub> cuprate superconductors

ORAL

Abstract

In cuprate high-Tc superconductors, enigmatic pseudogap state is considered to be a clue to its pairing mechanism. Recently electronic nematicity, characterized by four-fold rotational symmetry breaking in CuO2 plane, has emerged as a key signature inside pseudogap region. Here we report on elastoresistance measurements in Pb-substituted Bi2Sr2CaCu2O8+δ, which allow us to evaluate the nematic susceptibility from the change in in-plane resistivity induced by uniaxial strain. The nematic susceptibility shows Curie-Weiss-like enhancement toward pseudogap temperature T*, evidencing a second-order phase transition with rotational symmetry breaking. Near pseudogap critical point the Weiss temperature changes its sign and the magnitude of nematic susceptibility is strongly enhanced. This indicates the nematic quantum-critical fluctuations in cuprate superconductors.

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Presenters

  • Kousuke Ishida

    • Department of Advanced Materials Science, University of Tokyo

Authors

  • Kousuke Ishida

    • Department of Advanced Materials Science, University of Tokyo

  • Suguru Hosoi

    • Department of Advanced Materials Science, University of Tokyo

  • Yuki Teramoto

    • Graduate School of Science and Technology, Hirosaki University

  • Tomohiro Usui

    • Graduate School of Science and Technology, Hirosaki University

  • Yuta Mizukami

    • University of Tokyo
    • Department of Advanced Materials Science, University of Tokyo

  • Kenji Itaka

    • North Japan Research Institute for Sustainable Energy, Hirosaki University

  • Yuji Matsuda

    • Department of Physics, Kyoto Univ
    • Kyoto University
    • Department of Physics, Kyoto University
    • Kyoto Univ.

  • Takao Watanabe

    • Graduate School of Science and Technology, Hirosaki University

  • Takasada Shibauchi

    • Department of Advanced Materials Science, University of Tokyo
    • University of Tokyo
    • Univ. Tokyo