Mössbauer Study of Electronic Spin-Flip Processes in NH4 Fe(SO4)2 ·12H2O

Steen Mørup, N. Thrane.

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Relaxation-broadened Mössbauer spectra of ferric alum have been obtained in the temperature range 85-250 K, with 0-5-kG applied magnetic field. In fields above a few kG the spectra are only influenced by hyperfine fields fluctuating parallel to the applied-field direction. In low applied fields the spectra are also influenced by components of the hyperfine field fluctuating perpendicular to the applied-field direction, thereby inducing transitions between the nuclear sublevels. In the case of high applied fields, a simple model permits the determination of the spin-correlation time. In 5-kG applied fields, the spin-correlation time was found to decrease from 1.6±0.15 nsec at 85 K to 0.50±0.05 nsec at 245 K due to spin-lattice interactions. It is shown that these results cannot be compared with the values obtained by high-frequency susceptibility measurements.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Issue number7
Pages (from-to)2087-2091
Publication statusPublished - 1971

Bibliographical note

Copyright (1971) by the American Physical Society.


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