Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 76, Issue 9, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.76.093706
Keywords
(CuCl)LaNb2O7; spin gap; square lattice; ion exchange; frustration; Bose-Einstein condensation
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A quasi-two-dimensional S = 1/2 Heisenberg square-lattice antiferromagnet (CuCl)LaNb2O7 is studied by specific heat and magnetic susceptibility measurements in external fields up to 14T. The experimental results in low fields verify the absence of the order-disorder transition, as reported previously. By further application of magnetic fields, we obtain direct evidence for the phase transition, which can be interpreted as the Bose-Einstein condensation (BEC) of magnons. However, the critical field of 10T significantly deviates from that estimated from the zero-field gap, indicating that, unlike known experimental examples, the one-magnon mode is not a primary source to drive the BEC.
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