Abstract
The effect of high pressures up to 70 GPa on single-and polycrystalline samples of yttrium iron garnet Y3 57Fe5O12 is studied by Mossbauer absorption spectroscopy (for the 57Fe nucleus) in a diamond-anvil cell. It is found that the hyperfine magnetic field H hf at 57Fe nuclei vanishes abruptly at a pressure of 48 ± 2 GPa, which indicates the transition of the crystal from the ferrimagnetic state to nonmagnetic one. The magnetic transition is irreversible. When the pressure decreases, the magnetic state is not recovered and the garnet remains nonmagnetic until zero pressure. The behavior of the quadrupole splitting and isomer shift shows that, simultaneously with the magnetic transition, irreversible electron and possibly spin transitions occur with changes in the local crystalline structure. The mechanisms of the magnetic collapse are discussed.
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