most citedNonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry

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cond-mat1996

Determination of Exchange Parameters for CaV_4O_9

Ken'ichi Takano, K. Sano

Magnetic susceptibility measured for CaVO is analyzed by a method with high temperature expansion. The analysis is consistent with the -value which is close to 2 and is…