Journal
JETP LETTERS
Volume 88, Issue 8, Pages 524-530Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364008200125
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Funding
- Russian Foundation for Basic Research [08-02-00897-a, 07-0200490-a]
- Division of Physical Science, Russian Academy of Sciences
- U. S. Department of Energy [DE-FG02-02ER45955]
- Office of Basic Energy Sciences, U.S. Department of Energy
- National Nuclear Security Administration, U. S. Department of Energy
- U. S. National Science Foundation
- Tank-Automotive and Armaments Command, U. S. Department of Defense
- W. M. Keck Foundation
- U.S. Department of Energy (DOE) [DE-FG02-02ER45955] Funding Source: U.S. Department of Energy (DOE)
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The transition of Fe3+ ions from the high-spin (HS) state (S = 5/2) to the low-spin (LS) state (S = 1/2) has been observed in the BiFeO3 multiferroic crystal at high pressures in the range 45-55 GPa. This effect has been studied in high-pressure diamond-anvil cells by means of two experimental methods using synchrotron radiation: nuclear resonant forward scattering (NFS or synchrotron Mossbauer spectroscopy) and FeK (beta) high-resolution X-ray emission spectroscopy (XES). The HS-LS transition correlates with anomalies in the magnetic, optical, transport, and structural properties of the crystal. At room temperature, the transition is not stepwise, but is extended in a pressure range of about 10 GPa due to thermal fluctuations between the high-spin and low-spin states. It has been found that the transition of the BiFeO3 insulator to the metal occurs only in the low-spin phase and the cause of all phase transitions is the HS-LS crossover.
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