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Impure Exchange-Coupled Paramagnets; Electron-Paramagnetic-Resonance Studies

Impure Exchange-Coupled Paramagnets; Electron-Paramagnetic-Resonance Studies The effects of substituting Ni + + , Co + + , and Fe + + for Mn + + in RbMn F 3 on the EPR linewidth and g values have been studied as a function of impurity concentration and temperature above T N . Severe line broadening for relatively small impurity concentrations is observed with Fe + + and Co + + but not with Ni + + . The results are interpreted using both a high-temperature-moment method and a coupled-equation-of-motion approach. Both have as a central feature the importance of the interplay of host-impurity exchange rate ( ω ex ′ ) and impurity-single-ion spinlattice damping rate ( δ SL ) in determining the effects that the impurity has on the resonance linewidth. Quantitative agreement is found for the magnitude and temperature dependence of the linewidths for resonable values of ω ex ′ and δ SL . The interesting correspondence between these effects and the impurity-conduction-electron spin-resonance problem in metals is noted. An analysis of the sign and temperature dependence of the g shift in the RbMn F 3 : Ni system indicates that the local susceptibility of the Ni + + ion is negative throughout most of the temperature region studied. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Impure Exchange-Coupled Paramagnets; Electron-Paramagnetic-Resonance Studies

Physical Review B , Volume 6 (1) – Jul 1, 1972
16 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1972 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.6.58
Publisher site
See Article on Publisher Site

Abstract

The effects of substituting Ni + + , Co + + , and Fe + + for Mn + + in RbMn F 3 on the EPR linewidth and g values have been studied as a function of impurity concentration and temperature above T N . Severe line broadening for relatively small impurity concentrations is observed with Fe + + and Co + + but not with Ni + + . The results are interpreted using both a high-temperature-moment method and a coupled-equation-of-motion approach. Both have as a central feature the importance of the interplay of host-impurity exchange rate ( ω ex ′ ) and impurity-single-ion spinlattice damping rate ( δ SL ) in determining the effects that the impurity has on the resonance linewidth. Quantitative agreement is found for the magnitude and temperature dependence of the linewidths for resonable values of ω ex ′ and δ SL . The interesting correspondence between these effects and the impurity-conduction-electron spin-resonance problem in metals is noted. An analysis of the sign and temperature dependence of the g shift in the RbMn F 3 : Ni system indicates that the local susceptibility of the Ni + + ion is negative throughout most of the temperature region studied.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 1, 1972

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