Microscopic properties of γ-FeMn studied by Mossbauer spectroscopy

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  • Microscopic Properties of γ-FeMn Studied by Mössbauer Spectroscopy
  • Microscopic properties of g FeMn studied by Mossbauer spectroscopy

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Detailed analysis of hyperfine interactions in γ-Mn60Fe37Cu3 is presented. Isotropic three-dimensional Gaussian shape was introduced for modeling the distribution of hyperfine magnetic field derived from Mössbauer measurements performed in a broad temperature range. Electrical quadrupole interactions resulting from broken local symmetry, which cannot be treated as small perturbation in the vicinity of transition temperature, were treated by exact method of invariants. Obtained values of quadrupolar interactions are small and cause only spectra broadening. Small values of measured electric field gradient are confirmed by empirically found correlation between known quadrupolar splitting in selected class of systems and an estimation based on postulated pseudopotential. The effects of anharmonicity were considered in the interpretation of the temperature dependence of shift of the spectrum centre.

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