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Gapless spin liquid in a square-kagome lattice antiferromagnet

Author

Listed:
  • Masayoshi Fujihala

    (Department of Physics)

  • Katsuhiro Morita

    (Department of Applied Physics)

  • Richard Mole

    (Australian Nuclear Science and Technology Organisation)

  • Setsuo Mitsuda

    (Department of Physics)

  • Takami Tohyama

    (Department of Applied Physics)

  • Shin-ichiro Yano

    (National Synchrotron Radiation Research Center)

  • Dehong Yu

    (Australian Nuclear Science and Technology Organisation)

  • Shigetoshi Sota

    (RIKEN Center for Computational Science)

  • Tomohiko Kuwai

    (University of Toyama)

  • Akihiro Koda

    (Institute of Materials Structure Science, High Energy Accelerator Research Organisation)

  • Hirotaka Okabe

    (Institute of Materials Structure Science, High Energy Accelerator Research Organisation)

  • Hua Lee

    (Institute of Materials Structure Science, High Energy Accelerator Research Organisation)

  • Shinichi Itoh

    (Institute of Materials Structure Science, High Energy Accelerator Research Organisation)

  • Takafumi Hawai

    (Institute of Materials Structure Science, High Energy Accelerator Research Organisation)

  • Takatsugu Masuda

    (The University of Tokyo)

  • Hajime Sagayama

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization)

  • Akira Matsuo

    (Institute for Solid State Physics, The University of Tokyo)

  • Koichi Kindo

    (Institute for Solid State Physics, The University of Tokyo)

  • Seiko Ohira-Kawamura

    (J-PARC Center)

  • Kenji Nakajima

    (J-PARC Center)

Abstract

Observation of a quantum spin liquid (QSL) state is one of the most important goals in condensed-matter physics, as well as the development of new spintronic devices that support next-generation industries. The QSL in two dimensional quantum spin systems is expected to be due to geometrical magnetic frustration, and thus a kagome-based lattice is the most probable playground for QSL. Here, we report the first experimental results of the QSL state on a square-kagome quantum antiferromagnet, KCu6AlBiO4(SO4)5Cl. Comprehensive experimental studies via magnetic susceptibility, magnetisation, heat capacity, muon spin relaxation (μSR), and inelastic neutron scattering (INS) measurements reveal the formation of a gapless QSL at very low temperatures close to the ground state. The QSL behavior cannot be explained fully by a frustrated Heisenberg model with nearest-neighbor exchange interactions, providing a theoretical challenge to unveil the nature of the QSL state.

Suggested Citation

  • Masayoshi Fujihala & Katsuhiro Morita & Richard Mole & Setsuo Mitsuda & Takami Tohyama & Shin-ichiro Yano & Dehong Yu & Shigetoshi Sota & Tomohiko Kuwai & Akihiro Koda & Hirotaka Okabe & Hua Lee & Shi, 2020. "Gapless spin liquid in a square-kagome lattice antiferromagnet," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17235-z
    DOI: 10.1038/s41467-020-17235-z
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