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Chin. Phys. B, 2014, Vol. 23(3): 036401    DOI: 10.1088/1674-1056/23/3/036401
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Phase separation in Sr doped BiMnO3

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
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;
c NIST center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-8562, USA;
d School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Abstract  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.
Keywords:  phase separation      neutron/X-ray powder diffraction      charge/orbital order  
Received:  12 September 2013      Revised:  09 October 2013      Accepted manuscript online: 
PACS:  64.75.Qr (Phase separation and segregation in semiconductors)  
  75.25.Dk (Orbital, charge, and other orders, including coupling of these orders)  
  71.30.+h (Metal-insulator transitions and other electronic transitions)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074295 and 50872148) and the Natural Science Foundation of Guangxi Province, China (Grant No. 2012GXNSFGA060002).
Corresponding Authors:  Rao Guang-Hui     E-mail:  ghrao@iphy.ac.cn;rgh@guet.edu.cn

Cite this article: 

Li Guan-Nan (李冠男), Rao Guang-Hui (饶光辉), Huang Qing-Zhen (黄清镇), Gao Qing-Qing (高庆庆), Luo Jun (骆军), Liu Guang-Yao (刘广耀), Li Jing-Bo (李静波), Liang Jing-Kui (梁敬魁) Phase separation in Sr doped BiMnO3 2014 Chin. Phys. B 23 036401

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