Phase Transition in Y3Fe5O12 at High Pressures Observed by Raman Spectroscopy

The vibrational properties of yttrium iron garnet Y 3 Fe 5 O 12 at a high quasihydrostatic pressure are studied by the Raman spectroscopy method. Raman spectra are measured in a high-pressure diamond anvil cell in the pressure range of 0–72 GPa at room temperature. A fundamental change in the charac...

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Bibliographic Details
Published in:JETP letters 2021-12, Vol.114 (12), p.742-750
Main Authors: Aksenov, S. N., Mironovich, A. A., Lyubutin, I. S., Ivanova, A. G., Troyan, I. A., Sadykov, R. A., Saxen-Montua, Siddharth S, Gavriliuk, A. G.
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Language:English
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Summary:The vibrational properties of yttrium iron garnet Y 3 Fe 5 O 12 at a high quasihydrostatic pressure are studied by the Raman spectroscopy method. Raman spectra are measured in a high-pressure diamond anvil cell in the pressure range of 0–72 GPa at room temperature. A fundamental change in the character of spectra with the disappearance of sharp peaks is detected near ~50 GPa. This confirms a phase transition from the crystalline to amorphous state, which was previously detected by other experimental methods. This transition is accompanied by spin crossover in Fe 3+ ions, which transit from the high-spin (HS, S = 5/2) to low-spin (LS, S  = 1/2) state. The pressure dependences of phonon modes in Y 3 Fe 5 O 12 are measured from atmospheric pressure to the critical phase transition pressure.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364021240036