Determination of Exchange Parameters for CaV_4O_9

Details Determination of Exchange Parameters for CaV_4O_9 Determination of Exchange Parameters for CaV_4O_9

1996-09-07

arxiv.org/abs/cond-mat/9609073v1

Physics

Condensed Matter

11 pages, latex format, 3 figures available on request from takano@toyota-ti.ac.jp (please write your postal address; figures

Scientific paper

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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