Emergent XY-nematic fluctuations in heavily-hole doped iron-based superconductors

ORAL

Abstract

Electronic nematicity, rotational symmetry broken state originating from electronic mechanism, has been identified in several strong correlated systems. However, in contrast to its liquid crystal counterparts, the director of electronic nematic domains cannot point in an arbitrary direction (XY- nematic), but is confined to specific directions via non-negligible coupling to the lattice (Ising-nematic). Here we report the elastoresistance measurements in Ba1-xRbxFe2As2 and CsFe2As2, which can evaluate the nematic fluctuations from the change in the resistance induced by uniaxial strain. In RbFe2As2 and CsFe2As2, we found that B1g nematic fluctuations is more significant than B2g nematic fluctuations, providing the evidence for the nematicity along Fe-As direction in these compounds, 45 degree rotated from the unusual nematicity along Fe-Fe direction in the underdoped region. Furthermore, for the intermediate doping between these two distinct Ising-nematic phase, B1g and B2g nematic fluctuations exhibit identical Curie-Weiss behaviors, revealing that nearly XY-nematic fluctuation regime. This observation opens up a new route to realizing the novel electronic liquid crystal state in iron-based superconductors.

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Presenters

  • Kousuke Ishida

    • Univ of Tokyo-Kashiwanoha
    • Department of Advanced Materials Science, University of Tokyo

Authors

  • Kousuke Ishida

    • Univ of Tokyo-Kashiwanoha
    • Department of Advanced Materials Science, University of Tokyo

  • Masaya Tsujii

    • Univ of Tokyo-Kashiwanoha
    • Department of Advanced Materials Science, University of Tokyo

  • Suguru Hosoi

    • Univ of Tokyo-Kashiwanoha
    • Osaka University

  • Yuta Mizukami

    • University of Tokyo
    • Univ of Tokyo-Kashiwanoha
    • Advanced Materials Science, University of Tokyo
    • Department of Advanced Materials Science, University of Tokyo

  • Shigeyuki Ishida

    • National Institute of Advanced Industrial Science and Technology
    • National Institute of Advanced Industrial Science and Technology)
    • AIST

  • Akira Iyo

    • National Institute of Advanced Industrial Science and Technology

  • Hiroshi Eisaki

    • National Institute of Advanced Industrial Science and Technology
    • AIST
    • National Inst. Adv. Industrial Science & Technology, Tsukuba
    • National Institute of Advanced Industrial Science and Technology)
    • Electronics and Photonics Research Institute National Institute of Advanced Industrial Science and Technology, Japan

  • Kai Grube

    • Karlsruhe Institute of Technology
    • Institute fuer Festkoerperphysik, Karlsruhe Institute of Technology

  • Thomas Wolf

    • Karlsruhe Institute of Technology

  • Hilbert loehneysen

    • Karlsruhe Institute of Technology

  • Rafael M Fernandes

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
    • School of Physics and Astronomy, University of Minnesota
    • Physics, University of Minnesota

  • Takasada Shibauchi

    • University of Tokyo
    • Univ of Tokyo-Kashiwanoha
    • Advanced Materials Science, University of Tokyo
    • Department of Advanced Materials Science, University of Tokyo
    • Department of Advanced Material Science, University of Tokyo
    • Dept. Adv. Mat. Sci., Univ. Tokyo
    • Tokyo University