Temperature Dependence of the Local Mode in Cobalt‐Doped MnF2
作者:
T. M. Holden,
W. J. L. Buyers,
R. W. H. Stevenson,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 3
页码: 991-992
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1657814
出版商: AIP
数据来源: AIP
摘要:
The temperature dependence of the localized magnetic mode associated with cobalt impurities in MnF2has been studied by neutron inelastic scattering methods. The frequency of the localized mode, relative to its value at the lowest temperatures, falls with increasing temperature less rapidly than the sublattice magnetization and also less rapidly than the frequencies of the band modes in the doped crystal. The frequency of the local mode falls from 3.57±0.05(1012Hz) atT/TN=0.06 to 3.12±0.13(1012Hz) atT/TN=0.84. Results have also been obtained for the temperature dependence of the relative intensities of the neutron groups associated with the local and band modes. Molecular field calculations show that the cobalt ion produces an enhancement, at elevated temperatures, of the thermal average value of the spin on neighboring manganese ions over that in the pure material. This leads to a temperature dependence of the local modes smaller than that of the sublattice magnetization, as observed.
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