Field Induced versus Local Anisotropy in Single Ion Magnets
W. Sasa, R. Pe lkaa, M. Zentkováb
aInstitute of Nuclear Physics, Polish Academy of Sciences, E. Radzikowskiego 152, 31-342 Kraków, Poland
bInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040-01 Košice, Slovakia
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The aim of this paper is to compare the anisotropies in a system containing isolated magnetic centers produced by two independent effects. The first one is the interaction of an otherwise isotropic ion with the external magnetic, giving rise to the field induced anisotropy. The other one is due to the local interaction with the ligand field known as the zero field splitting. Integer and half integer spins are considered. Field induced anisotropy is of the easy-plane character and, under the constraint of gμBSH=D, it is inferior to that due to zero field splitting except for the case of the half integer spin at the lowest temperatures. At high temperature the anisotropy vanishes independent of the spin parity as expected.

DOI:10.12693/APhysPolA.137.952
topics: single ion magnet, magnetic susceptibility, field induced anisotropy