“The energy spectrum of quadrupole impurity centers of different types in antiferromagnets |
| |
Authors: | M A Ivanov V Ya Mitrofanov A Ya Fishman |
| |
Institution: | (1) Institute of Metal Physics, Ukrainian National Academy of Sciences, 252142 Kiev, Ukraine;(2) Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, 620016 Ekaterinburg, Russia |
| |
Abstract: | We study the energy spectrum and some properties of various quadrupole centers (magnetic impurities or magnetic impurity complexes
that are symmetric with respect to the magnetic sublattices of the antiferromagnet). We allow for the effect of spin-phonon
coupling on the quadrupole splitting parameter and show that such coupling can lead to a considerable decrease in the value
of this parameter and even change its sign. We investigate the behavior of quadrupole centers with an orbitally degenerate
ground state and of quadrupole impurity complexes formed by mixed-valence ions. We demonstrate that such centers may greatly
affect the resonant, magnetic, and thermodynamic properties of antiferromagnets. Finally, we analyze the existing experimental
data and show that several new effects can be observed in systems with such centers (in particular, a magnetic analog of the
Jahn-Teller effect and a strong magnetoelectric effect).
Zh. éksp. Teor. Fiz. 111, 964–978 (March 1997) |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|