  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.
