Pressure-induced electron spin transition in the paramagnetic phase of the GdFe3(BO3)4 Heisenberg magnet

The HS → LS spin crossover effect (high-spin → low-spin transition) induced by high pressure in the range 45–53 GPa is observed in trivalent Fe3+ ions in the paramagnetic phase of a Gd57Fe3(BO3)4 gadolinium iron borate crystal. This effect is studied in high-pressure diamond-anvil cells by two exper...

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Bibliographic Details
Published in:JETP letters 2007-01, Vol.84 (9), p.518-523
Main Authors: Lyubutin, I. S., Gavriliuk, A. G., Struzhkin, V. V., Ovchinnikov, S. G., Kharlamova, S. A., Bezmaternykh, L. N., Hu, M., Chow, P.
Format: Article
Language:English
Subjects:
Crossovers
Diamonds
Electron spin
Forward scattering
Gadolinium
High pressure
Iron
Order parameters
Spin transition
Synchrotron radiation
Synchrotrons
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Summary:The HS → LS spin crossover effect (high-spin → low-spin transition) induced by high pressure in the range 45–53 GPa is observed in trivalent Fe3+ ions in the paramagnetic phase of a Gd57Fe3(BO3)4 gadolinium iron borate crystal. This effect is studied in high-pressure diamond-anvil cells by two experimental methods using synchrotron radiation: nuclear resonant forward scattering (NFS) and Fe Kβ high-resolution x-ray emission spectroscopy (XES). The manifestation of the crossover in the paramagnetic phase, which has no order parameter to distinguish between the HS and LS states, correlates with the optical-gap jump and with the insulator-semiconductor transition in the crystal. Based on a theoretical many-electron model, an explanation of this effect at high pressures is proposed.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364006210119