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High pressure Raman investigations of multiferroic BiFeO3
被引:46
|作者:
Yang, Y.
[1
]
Bai, L. G.
[2
]
Zhu, K.
[1
]
Liu, Y. L.
[1
]
Jiang, S.
[2
]
Liu, J.
[2
]
Chen, J.
[3
]
Xing, X. R.
[3
]
机构:
[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[3] Univ Sci & Technol Beijing, Dept Phys Chem, Beijing 100083, Peoples R China
关键词:
THIN-FILMS;
TEMPERATURE;
D O I:
10.1088/0953-8984/21/38/385901
中图分类号:
O469 [凝聚态物理学];
学科分类号:
070205 ;
摘要:
We have reported a Raman scattering investigation of bismuth ferrite (BiFeO3) under high pressure up to 50 GPa. Distinct changes in the Raman spectra show evidence for three pressure-induced structural transitions. The abrupt frequency redshifts of the Raman modes near 300 cm(-1) at around 3 GPa are attributed to the modulation of the FeO6 octahedral tilts. The disappearance of the modes below 250 cm(-1) at 8.6 GPa, together with the enhancement of the two modes in the range of 300-400 cm(-1), indicate the phase transition from the rhombohedral to orthorhombic symmetry. Afterward, the E-3 and E-4 modes disappear at 44.6 GPa, pointing to the occurrence of the orthorhombic-cubic phase transition, which is consistent with the previous postulate that an orthorhombic-cubic transition takes place across the metal-insulator transition at high pressures.
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