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

S. Mørup and N. Thrane
Phys. Rev. B 4, 2087 – Published 1 October 1971
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Abstract

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.

  • Received 9 July 1970

DOI:https://doi.org/10.1103/PhysRevB.4.2087

©1971 American Physical Society

Authors & Affiliations

S. Mørup and N. Thrane

  • Laboratory of Applied Physics II, Technical University of Denmark, DK 2800 Lyngby, Denmark

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Vol. 4, Iss. 7 — 1 October 1971

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