Observation of second-order quadrupole shift in Mössbauer spectrum of amorphous YIG (yttrium iron garnet)
- 15 March 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 25 (6), 4256-4259
- https://doi.org/10.1103/physrevb.25.4256
Abstract
A previously unsuspected quadrupole shift of the nuclear Zeeman lines in amorphous magnets has been observed by Mössbauer spectroscopy in speromagnetic amorphous yttrium iron garnet at 4.2 K. The distinctive shift pattern is shown to arise theoretically as a second-order perturbation of the Zeeman levels by the distribution of electric field gradients in the amorphous state. It is observed to have a form which agrees quantitatively with theoretical expectation if the relative orientation of the electric-field-gradient axes and the hyperfine-field direction at each iron site is random.
Keywords
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