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

doi:10.1088/1674-1056/22/7/077502

Abstract The R/Ba-ordered and R-site mixed compound Y_0.5La_0.5BaMn₂O₆ has been synthesized in which (Y, La) and Ba are regularly arranged while Y and La randomly occupy the R-site. Y_0.5La_0.5BaMn₂O₆ 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 T_N～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 Y_0.5La_0.5BaMn₂O₆ 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 Y_0.5La_0.5BaMn₂O₆ compound 2013 Chin. Phys. B 22 077502

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

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R-site cation randomness effect in thec A-site ordered Y_0.5La_0.5BaMn₂O₆ compound