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Chin. Phys. B, 2013, Vol. 22(7): 077502    DOI: 10.1088/1674-1056/22/7/077502
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

R-site cation randomness effect in thec A-site ordered Y0.5La0.5BaMn2O6 compound

Gao Qing-Qing (高庆庆)a, Li Jing-Bo (李静波)b, Li Guan-Nan (李冠男)a, Rao Guang-Hui (饶光辉)c, Luo Jun (骆军)a, Liu Guang-Yao (刘广耀)a, 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, Beijing Institute of Technology, Beijing 100081, China;
c School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Abstract  The R/Ba-ordered and R-site mixed compound Y0.5La0.5BaMn2O6 has been synthesized in which (Y, La) and Ba are regularly arranged while Y and La randomly occupy the R-site. Y0.5La0.5BaMn2O6 has a tetragonal unit cell with a space group of P4/mmm. A structural transition between tetragonal and orthorhombic is observed at about 325 K by X-ray powder diffraction (XRD). Thermal magnetic measurement shows the occurrence of an antiferromagnetic transition at the temperature TN~190 K. Anomalies in magnetization, resistivity and lattice parameters observed around 340 K indicate a charge/orbital order transition accompanying the structural phase transition. R-site randomness effect is discussed to interpret the different properties of Y0.5La0.5BaMn2O6 between NdBaMn2O6 and SmBaMn2O6.
Keywords:  A-site ordering      structural transition      charge/orbital ordering      X-ray powder diffraction  
Received:  15 March 2013      Accepted manuscript online: 
PACS:  75.25.Dk (Orbital, charge, and other orders, including coupling of these orders)  
  61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50872148, 51072225, and 11074295) and the Natural Science Foundation of Guangxi Province, China (Grant No. 2012GXNSFGA060002).
Corresponding Authors:  Li Jing-Bo     E-mail:  lijb@bit.edu.cn

Cite this article: 

Gao Qing-Qing (高庆庆), Li Jing-Bo (李静波), Li Guan-Nan (李冠男), Rao Guang-Hui (饶光辉), Luo Jun (骆军), Liu Guang-Yao (刘广耀), Liang Jing-Kui (梁敬魁) R-site cation randomness effect in thec A-site ordered Y0.5La0.5BaMn2O6 compound 2013 Chin. Phys. B 22 077502

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