Pressure-induced electron spin transition in the paramagnetic phase of the GdFe3(BO3)4 Heisenberg magnet |
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| Authors: | I. S. Lyubutin A. G. Gavriliuk V. V. Struzhkin S. G. Ovchinnikov S. A. Kharlamova L. N. Bezmaternykh M. Hu P. Chow |
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| Affiliation: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333, Russia;(2) Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia;(3) Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA;(4) Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia;(5) Advanced Photon Source, ANL, Argonne, IL 60439, USA |
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| Abstract: | 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 K β 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. |
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