Polarized Raman scattering of multiferroic BiFeO3 epitaxial films with rhombohedral R3c symmetry - art. no. 042907
Polarized Raman scattering of multiferroic BiFeO3 epitaxial films with rhombohedral R3c symmetry - art. no. 042907
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DOI：
10.1063/1.2168038
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发表时间：
2006-01-23
影响因子：
4
通讯作者：
Jo, MH
中科院分区：
文献类型：
--
作者：
Singh, MK;Jang, HM;Jo, MH
通过脉冲激光沉积在 (111) SrTiO3 基底上生长高度 (111) 取向的菱形 BiFeO3 (BFO) 薄膜。通过采用两种不同的背向散射几何形状，对具有菱面体 R3c 对称性的 (111) 取向外延 BFO 薄膜进行了偏振拉曼散射研究。通过在新型侧视背向散射中采用 Y-'(ZZ)Y-' 偏振配置，将 A(1) 对称横向光学 [A(1)(TO)] 声子与 E 对称横向光学 [E(TO)] 声子选择性分离。通过比较法向反向散射中的 Y-'(ZZ)Y-' 谱与 Z((XX')-X-')Z 偏振谱，我们能够分配 R3c BFO 的大部分 A(1) 和 E 对称法向模式。此外，我们发现 A(1) 对称简正模中的 LO-TO 分裂可以忽略不计。
Highly (111)-oriented rhombohedral BiFeO3 (BFO) thin films were grown on (111) SrTiO3 substrates by pulsed laser deposition. Polarized Raman-scattering study of the (111)-oriented epitaxial BFO thin film with rhombohedral R3c symmetry was carried out by employing two distinct backscattering geometries. The A(1)-symmetry transverse-optical [A(1)(TO)] phonons were selectively isolated from the E-symmetry transverse-optical [E(TO)] phonons by employing Y-'(ZZ)Y-' polarization configuration in a novel side-view backscattering. By comparing the Y-'(ZZ)Y-' spectrum with the Z((XX')-X-')Z polarization spectrum in a normal backscattering, we were able to assign most of A(1) and E-symmetry normal modes of R3c BFO. In addition, we found that there was a negligible LO-TO splitting in the A(1)-symmetry normal modes.