Gapless spin liquid in a square-kagome lattice antiferromagnet.
basic_science · Level V
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- Record sourced from PubMed, PMID 32647219.
- Also identified by DOI 10.1038/s41467-020-17235-z and PMC identifier 7347939.
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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, KCu<sub>6</sub>AlBiO<sub>4</sub>(SO<sub>4</sub>)<sub>5</sub>Cl. 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.