Determination of Exchange Parameters for CaV4O9
Abstract
Magnetic susceptibility measured for CaV4O9 is analyzed by a method with high temperature expansion. The analysis is consistent with the g-value which is close to 2 and is observed by an ESR experiment. Four exchange parameters in a two-dimensional Heisenberg model are determined to represent CaV4O9. All the exchange parameters are about 500 K and strongly frustrated. The observed spin gap originates from the frustration.
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