Determination of Exchange Parameters for CaV₄O₉

Ken'ichi Takano , K. Sano

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classification ❄️ cond-mat

keywords exchangeparametersobservedanalysisanalyzedcloseconsistentdetermination

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Magnetic susceptibility measured for CaV$_4$O$_9$ 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 CaV$_4$O$_9$. All the exchange parameters are about 500 K and strongly frustrated. The observed spin gap originates from the frustration.

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Determination of Exchange Parameters for CaV₄O₉

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