Gapless spin liquid in a square-kagome lattice antiferromagnet

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, Shinichi Itoh, Takafumi Hawai, Takatsugu Masuda, Hajime Sagayama, Akira Matsuo, Koichi Kindo, Seiko Ohira-Kawamura and Kenji Nakajima
Additional contact information
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

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-17235-z

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