High-spin-low-spin transition and the sequence of the phase transformations in the BiFeO[subscript 3] crystal at high pressures

Journal Article · Thu Dec 10 04:00:00 EST 2009 · JETP Lett.

DOI:https://doi.org/10.1134/S0021364008200125· OSTI ID:1007140

Lyubutin, I S; Gavriliuk, A G; Struzhkin, V V ^[1]

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1. Russ. Acad. Sci.

The transition of Fe{sup 3+} ions from the high-spin (HS) state (S = 5/2) to the low-spin (LS) state (S = 1/2) has been observed in the BiFeO{sub 3} 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 Moessbauer 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 BiFeO{sub 3} insulator to the metal occurs only in the low-spin phase and the cause of all phase transitions is the HS-LS crossover.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1007140
• Journal Information: JETP Lett., Journal Name: JETP Lett. Journal Issue: (8) ; 12, 2008 Vol. 88
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
EMISSION SPECTROSCOPY
FLUCTUATIONS
MOESSBAUER EFFECT
PHASE TRANSFORMATIONS
PRESSURE RANGE
SCATTERING
SYNCHROTRON RADIATION
SYNCHROTRONS
TRANSPORT