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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.
Physical Review B – American Physical Society (APS)
Published: Jul 1, 1972
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