title: Microscopic approach to the pseudo-spin-1/2 Hamiltonian for Kramers doublets in exchange coupled Co(II) pairs.
abstract: The microscopic theory of the magnetically anisotropic effective pseudo-spin-(1)/(2) Hamiltonian for a pair of Co(2+) ions is reported. In the framework of the second-order perturbation approach, the analytical expressions are found for the components of the tensor of the exchange interaction, g-tensor, and the factor in the temperature independent paramagnetic contribution. The parameters of the Hamiltonian are expressed in terms of the basic intra- and intercenter parameters of the pair, namely, the spin-orbit coupling constant, orbital reduction factor, exchange integral, and low symmetry crystal field parameters including axial and rhombic terms.
authors.affiliation: Instituto de Ciencia Molecular, Universidad de Valencia, C/Dr. Moliner 50, 46100-Burjassot (Valencia), Spain.
authors.forename: Andrei V
authors.initials: AV
authors.lastname: Palii
authors.forename: Boris S
authors.initials: BS
authors.lastname: Tsukerblat
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.forename: Juan M
authors.initials: JM
authors.lastname: Clemente-Juan
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Borrás-Almenar