Magnetic dipolar and electric quadrupolar effects on the Mössbauer spectra of magnetite above the Verwey transition

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ID: 117925
1970
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Abstract
Mössbauer spectroscopic studies (57Fe) of powdered magnetite have been undertaken between 120 K and 880 K. Below the magnetic transition temperature (T C=839.5 K) three six-line patterns have been fitted to our experimental spectra. The broadening of the B-pattern is explained by two magnetically non-equivalent B-site irons, suggesting broadening due to electron hopping to be negligible. In the paramagnetic state the electric quadrupole splittings of iron at A-and B-sites are found to be constant, independent of temperature, having the values zero and 0.16 mm/s, respectively. The centroid shifts, on the other hand, show above 700 K large deviations from the calculated second order Doppler shift. It is proposed that the deviations arise from a variation in band overlap. The temperature variation of the magnetic fields is found to be proportional to the sublattice magnetization. The difference in the magnetic fields at the two non-equivalent B-sites is measured to be 1.1 T at 310 K.
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Authors L. Häggström;H. Annersten;T. Ericsson;R. Wäppling;W. Karner;S. Bjarman;L. Häggström;H. Annersten;T. Ericsson;R. Wäppling;W. Karner;S. Bjarman;
Journal hyperfine interactions
Year 1970
DOI
doi:10.1007/BF01021693
URL
https://doi.org/10.1007%2FBF01021693
Keywords
condensed matter physics Molecular nuclear physics heavy ions hadrons atomic optical and plasma physics surfaces and interfaces thin films

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