Spin-lattice coupling phase transition and phonon anomalies in bismuth ferrite BiFeO3
作者： Cheng-Sao Chen , Chi-Shun Tu , Pin-Yi Chen , V.H. Schmidt , Zhe-Rui Xu
DOI: 10.1016/J.JALLCOM.2016.06.193
关键词: Ferromagnetism 、 Tetragonal crystal system 、 Condensed matter physics 、 Néel temperature 、 Single crystal 、 Materials science 、 Crystal 、 Bismuth ferrite 、 Magnetization 、 Phase transition
摘要: Abstract Phase transition, phonon vibration, and magnetization in (100) BiFeO3 (BFO) multiferroic single crystals have been characterized as functions of temperature. The BFO crystal exhibits a weak ferromagnetic hysteresis loop possibly due to appearance Fe O orderings modulation the bond. Zero-field-cooled (ZFC) field-cooled (FC) magnetic susceptibilities suggest spin-glass behavior below ∼200 K. High-resolution transmission electron microscopy (HRTEM) suggests rhombohedral R3c symmetry (with tilted FeO6 octahedra) lattice distortion surface layer. undergoes structural transition sequence rhombohedral−tetragonal−orthorhombic− cubic at ∼620–640, ∼1000, ∼1100 K, respectively. spin-lattice coupling accounts for tetragonal upon approaching Neel temperature (TN). low-frequency Raman-active modes ψ4,II, E(1), A1(1), A1(2) reveal clear softening anomalies frequency shifts broad peaks full-width-at-half-maximum (FWHM) around 450 K, which is attributed ordering without change symmetry.
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