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M. I. Afanasov, M. V. Korolenko, M. A. Kolotyrkina, P. B. Fabritchnyi
Effect of valence state of antimony dopant ions
on their spin polarization by chromium cations on the surface of Cr2O3 antiferromagnet
Abstract
Effect of As shown by 121Sb Mössbauer
measurements, oxidation of Sb(III) ions located on the surface of Cr2O3
produces an increase in the value of transferred hyperfine field H(121Sb)
of about a factor of 2. The observed variation is consonant with that
previously reported for 119Sn surface dopant ions. The increase in H
– to be related to removal of the lone-pair – indicates that spin polarization
of both Sb(V) and Sn(IV) ions within
ferrodielectric matrix is governed by the same mechanism: 3d-electron density
transfer from neighboring paramagnetic cations into 5s-orbitals of the
diamagnetic ones.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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