中国物理B ›› 2014, Vol. 23 ›› Issue (3): 36401-036401.doi: 10.1088/1674-1056/23/3/036401
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
李冠男a, 饶光辉b, 黄清镇c, 高庆庆a, 骆军a, 刘广耀a, 李静波d, 梁敬魁a
Li Guan-Nan (李冠男)a, Rao Guang-Hui (饶光辉)b, Huang Qing-Zhen (黄清镇)c, Gao Qing-Qing (高庆庆)a, Luo Jun (骆军)a, Liu Guang-Yao (刘广耀)a, Li Jing-Bo (李静波)d, Liang Jing-Kui (梁敬魁)a
摘要: Phase separation in Sr doped BiMnO3 (Bi1-xSrxMnO3, x=0.4–0.6) was studied by means of temperature-dependent high-resolution neutron powder diffraction (NPD), high resolution X-ray powder diffraction (XRD), and physical property measurements. All the experiments indicate that a phase separation occurs at the temperature coinciding with the reported charge ordering temperature (TCO) in the literature. Below the reported TCO, both the phases resulting from the phase separation crystallize in the orthorhombically distorted perovskite structure with space group Imma. At lower temperature, these two phases order in the CE-type antiferromagnetic structure and the A-type antiferromagnetic structure, respectively. However, a scrutiny of the high-resolution NPD and XRD data at different temperatures and the electron diffraction experiment at 300 K did not manifest any evidence of a long-range charge ordering (CO) in our investigated samples, suggesting that the anomalies of physical properties such as magnetization, electric transport, and lattice parameters at the TCO might be caused by the phase separation rather than by a CO transition.
中图分类号: (Phase separation and segregation in semiconductors)