Mossbauer effect measurements in ferromagnetic crxteycompounds

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Abstract
The hyperfine interactions in ferromagnetic cr2te3, crte and cr2te were studied by means of the mossbauer effect in 129i and 125te. The 129i measurements in crte and cr2te (at temperatures below tc) revealed the existence of two equally populated sets of te(i) sites with different internal fields acting at the iodine impurities nuclei. This was explained as being due to nonstoichiometry and the presence of interstitial chromium ions in the tetrahedral holes. The magnetic fields measured on the 125te nuclei in crte and cr2te were found to be considerably lower than those measured on the 129i impurities. A discussion of a transferred hyperfine interaction mechanism compatible with this trend, based upon the unpairing of the 5s electrons due to overlap with the 3de(g) orbitals is presented.