Electron Spin Resonance ofin Yttrium Gallium Garnet and Yttrium Aluminum Garnet
- 10 February 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 166 (2), 269-278
- https://doi.org/10.1103/physrev.166.269
Abstract
Electron-spin-resonance data at 4.2°K have been obtained for in the octahedral sites of yttrium gallium garnet (YGaG) and yttrium aluminum garnet (YAlG). The experimental values are , , , and for YGaG, and , , , and for YAlG, where the hyperfine constants are in units of . From an analysis of the values of the low-spin system, one obtains in YGaG and -0.78 in YAlG, where is the trigonal field parameter and is the spin-orbit coupling constant. Thus the trigonal field in the garnets is negative and opposite in sign to the trigonal field of the octahedral site in corundum. The core polarization field obtained from the hyperfine constants is -220 kG/(unpaired spin) in YGaG and -250 kG/(unpaired spin) in YAlG, which is about twice the approximately constant value of -125 kG/spin found in the series.
Keywords
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