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.
Highlights
Background dBackground Time e c T = 58 mK f LF 50GRelaxation rate 1000 G 500 G 50 G Background g1Muon site a + bH b c a c a b = 0.46 = 2
The space group and structural parameters of KCu6AlBiO4(SO4)5Cl are determined as P 4/ncc, and a = 9.8248(9) Å, c = 20.5715(24) Å, respectively
In each SK unit, the square is enclosed by four scalene triangles
Summary
In each SK unit, the square is enclosed by four scalene triangles This feature suggests the absence of any long-range order down to 1.8 K. If this spectrum is due to static magnetism, the internal field (estimate as λZF/γμ, where γμ is the muon gyromagnetic ratio) should be less than 20 G. The increase of λ at around T* renders evidence for a slowing down of the spin fluctuation resulting from the development of short-range correlations They exhibit a plateau with weak temperature a
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