Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 74, Issue 12, Pages 3155-3158Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.74.3155
Keywords
magnetization; spin liquid; square lattice; J(1)-J(2) model; ion-exchange reaction; bound state; (CuCl)LaNb2O7
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High-field magnetization measurements have been performed up to 56T for a two-dimensional S = 1/2 frustrated square-lattice antiferromagnet (CuCI)LaNb2O7, a recently discovered spin gap system (Delta/k(B) = 26.7 K). It is found that the spin gap closes at a surprisingly low field H-cl = 10.3 T compared with that expected from the zero-field spin gap (Delta/g mu(B) = 18.4 T). For H > H-c1, the magnetization exhibits a linear increase without any trace of anomalies such as fractional plateaus until it saturates at H-c2 = 30.1 T. This means that the gapless phase, where the field-induced magnetic ordering is expected to occur at low temperatures, is stable over a wide field region. These results suggest strong correlations of triplet excitations in the layer and the proximity of the spin-liquid phase to the magnetically ordered phase.
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