Quantum spin liquid in frustrated one dimensional LiCuSbO4

Details Quantum spin liquid in frustrated one dimensional LiCuSbO4 Quantum spin liquid in frustrated one dimensional LiCuSbO4

2011-09-19

arxiv.org/abs/1109.4061v3

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 4 figures. To appear in PRL

Scientific paper

A quantum magnet, LiCuSbO4, with chains of edge-sharing S = 1/2 CuO6 octahedra is reported. While the Curie-Weiss constant is ferromagnetic, \theta = 30 K, no phase transition or spin freezing occurs down to 100 mK. Specific heat indicates a distinct high field phase near the 12 T saturation field. Neutron scattering shows incommensurate spin correlations with q = 0.47\pm0.01{\pi}/a and places an upper limit of 70 \mueV on a potential spin gap. Exact diagonalization of easy plane S = 1/2 chains with competing ferro- and antiferromagnetic interactions (J1 = - 75 K, J2 = 34 K) accounts for the T > 2 K data.

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