IMPURITY MAGNONS ASSOCIATED WITH Co IONS IN RbMnF3Report as inadecuate




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Abstract : Raman scattering from impurity so-d pair modes is reported in RbMnF3-Co near 263 cm-1. An Ising Hamiltonian leads to a — 4.3 cm-1 JMn-Co value and allows to calculate the frequencies of impurity modes. The calculated frequency of the s0 mode is in agreement with a value obtained by scaling the s0 mode measured in Co doped KMnF3 by neutron scattering. Selection rules are studied with and without an applied magnetic field for different samples orientations. Resulting from the low anisotropy it is shown both theoretically and experimentally that the selection rules have to be expressed with reference to the Oh paramagnetic cubic symmetry rather than the D4hC4h rigorous magnetic symmetry around the impurity : the s0-d mode then belongs to the Ɖ+3 representation in Oh. The selection rules are the same as in RbMnF3-Ni.





Author: P. Moch R. Moyal C. Dugautier H. Guggenheim

Source: https://hal.archives-ouvertes.fr/



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