Magnetic Properties Near the ⁵T₂ - ¹A₁ Crossover
When a d6 transition metal ion is in an octahedral or pseudo-octahedral crystal field of suitable strength, the zero-point energies of the two possible ground states, 5T2 and 1A1, may be sufficiently close to permit appreciable populations of both states at temperatures accessible in the laboratory. In such a situation, the magnetic moments exhibit a marked temperature dependence, and differ markedly from those expected when only one of the states is appreciably populated. The magnetic properties expected near the “crossover” of the 5T2 and 1A1 states are described from a theoretical view point, and the approximations made are discussed in detail. By way of example, the magnetic behaviour of a series of ferrous complexes, believed to lie near the 5T2-1A1 crossover, are examined, and estimates of the separation of the two states are made for each of the complexes by comparison of the observed magnetic behaviour with the theory. © 1968.
C. M. Harris and E. Sinn, "Magnetic Properties Near the ⁵T₂ - ¹A₁ Crossover," Inorganica Chimica Acta, Elsevier, Jan 1968.
The definitive version is available at http://dx.doi.org/10.1016/S0020-1693(00)87045-0
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© 1968 Elsevier, All rights reserved.