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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Published in: | JETP letters 2021-12, Vol.114 (12), p.742-750 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0021-3640 1090-6487 |
DOI: | 10.1134/S0021364021240036 |