Mössbauer Studies of Fe57 in Orthoferrites

M. Eibschütz, S. Shtrikman, and D. Treves
Phys. Rev. 156, 562 – Published 10 April 1967
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Abstract

The hyperfine interactions of the iron nuclei in the orthoferrites were studied between 85 and 770°K using the Mössbauer effect. The temperature dependence of the sublattice magnetization σs(T) is compared with various statistical-mechanical theories. It obeys approximately a 13 power law in the temperature range 0.60<TTN<0.99, and spin-wave theory and Callen decoupling at low temperature in the range TTN<0.5. From σs(T), it is found that the canting angle in these weak ferromagnets is temperature-independent. The exchange integral calculated from the Oguchi spin-wave theory agrees with that calculated from Rushbrook and Wood's high-temperature series expansion and the Green's-function theories, while that calculated from the molecular field and Kubo's spin-wave theories is considerably lower. The quadrupole coupling constant is in good agreement with values calculated by point-charge lattice sums. The specific heat obtained from the temperature shift at high temperature agrees with the Dulong-Petit law. The value of the isomer shift is equal to that expected for a trivalent iron ion.

  • Received 31 October 1966

DOI:https://doi.org/10.1103/PhysRev.156.562

©1967 American Physical Society

Authors & Affiliations

M. Eibschütz, S. Shtrikman, and D. Treves*

  • Department of Electronics, The Weizmann Institute of Science, Rehovoth, Israel

  • *Temporary address: Ampex Corporation, Redwood City, California.

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Issue

Vol. 156, Iss. 2 — April 1967

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