Mössbauer Studies ofin Orthoferrites
- 10 April 1967
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 156 (2), 562-577
- https://doi.org/10.1103/physrev.156.562
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 is compared with various statistical-mechanical theories. It obeys approximately a power law in the temperature range , and spin-wave theory and Callen decoupling at low temperature in the range . From , 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.
Keywords
This publication has 59 references indexed in Scilit:
- Electric Field Gradient Calculations in Transition-Metal SesquioxidesPhysical Review B, 1966
- Differential Thermal Analysis and Mössbauer Studies in Rare-Earth OrthoferritesJournal of Applied Physics, 1964
- Interpretation of experimental Mössbauer spectrum areasNuclear Instruments and Methods, 1963
- The effect of line broadening of Mössbauer resonant sources and absorbers on the resonance absorptionNuclear Instruments and Methods, 1963
- Transmission and line broadening in the Mössbauer effect. IINuclear Instruments and Methods, 1963
- Transmission and line broadening of resonance radiation incident on a resonance absorberNuclear Instruments and Methods, 1961
- Einige Bemerkungen zur Theorie des Mößbauer-EffektesThe European Physical Journal A, 1961
- Resonance Absorption of Nuclear Gamma Rays and the Dynamics of Atomic MotionsPhysical Review B, 1960
- Kernresonanzabsorption nicht Doppler-verbreiterter Gammastrahlung in Re187The European Physical Journal A, 1960
- Magnetic Properties of Some Orthoferrites and Cyanides at Low TemperaturesPhysical Review B, 1956