Abstract
AbstractWe derive an anisotropy energy VA, a spin‐atomic vibration interaction VSA, and a spin‐flip Hamiltonian VSF of a single atomic spin system, “Fe2+ (3d6) in a crystal field of tetragonal symmetry”. The perturbation theory is here applied to the system with the spin‐orbit interaction and the kinetic and potential energies, in which difference of vibration displacement between a nucleus and electrons is taken into account. We first find conditions to enhance a coefficient |D | of VA = – |D |S2Z, with SZ being the Z component of a spin operator. Second, the presence or absence of VSA and VSF is shown for any parameter sets. Also, some coefficients of VSA are proportional to 1/√f, with f being a vibration frequency, although a coefficient of the conventional spin‐phonon interaction has √f (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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