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Title: Gapless spin liquid in a square-kagome lattice antiferromagnet
Authors: Fujihala, M
Morita, K
Mole, RA
Mitsuda, S
Tohyama, T
Yano, SI
Yu, DH
Sota, S
Kuwai, T
Koda, A
Okabe, H
Lee, H
Itoh, H
Hawai, T
Masuda, T
Sagayama, H
Matsuo, A
Kindo, K
Ohira-Kawamura, S
Nakajima, K
Keywords: Quantum states
Experiment results
Crystal lattices
Inelastic scattering
Heisenberg model
Issue Date: 9-Jun-2020
Publisher: Springer Nature Limited
Citation: Fujihala, M., Morita, K., Mole, R., Mitsuda, S., Tohyama, T., Yano, S.-i., Yu, D., Sota, S., Kuwai, T., Koda, A., Okabe, H., Lee, H., Itoh, H., Hawai, T., Masuda, T., Sagayama, H., Matsuo, A., Kindo, K., Ohira-Kawamura, S., & Nakajima, K. (2020). Gapless spin liquid in a square-kagome lattice antiferromagnet. Nature Communications, 11(1), 3429. doi:10.1038/s41467-020-17235-z
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. © 2020 Springer Nature Limited
Gov't Doc #: 9761
ISSN: 2041-1723
Appears in Collections:Journal Articles

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