Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-19
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.
Andersen Niels. H.
Broholm Collin L.
Cava Robert. J.
Dutton S. E.
Huang Qingzhen
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