Analysis of the spin exchange interactions in the extended magnetic solids K2NiF4, K2CuF4, La2CuO4, Nd2CuO4, KNiF3, and KCuF3

摘要

The spin exchange parameters J of the extended magnetic solids K2NiK4, K2CuF4, La2CuO4, Nd2CuO4, KNiF3, and KCuF3 were analyzed by examining the structures of their spin monomers and calculating the energy differences Delta e in the spin levels of their spin dimers. The trends in the observed J parameters are well explained in terms of the Delta e values obtained from extended Huckel molecular orbital calculations. The Delta e value of a spin dimer is related only to the antiferromagnetic component of its J, but the spin dimer analysis based on Delta e allows one to correlate the nature of the magnetic interaction with the structure of the spin dimer. (C) 2000 Academic Press. [References: 35]