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

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

中国物理B ›› 2013, Vol. 22 ›› Issue (7): 77502-077502.doi: 10.1088/1674-1056/22/7/077502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

高庆庆^a, 李静波^b, 李冠男^a, 饶光辉^c, 骆军^a, 刘广耀^a, 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

收稿日期:2013-03-15 出版日期:2013-06-01 发布日期:2013-06-01
基金资助:
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).

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

Received:2013-03-15 Online:2013-06-01 Published:2013-06-01
Contact: Li Jing-Bo E-mail:lijb@bit.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: A-site ordering, structural transition, charge/orbital ordering, X-ray powder diffraction

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.

Key words: A-site ordering, structural transition, charge/orbital ordering, X-ray powder diffraction

中图分类号: (Orbital, charge, and other orders, including coupling of these orders)

75.25.Dk

61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)

高庆庆, 李静波, 李冠男, 饶光辉, 骆军, 刘广耀, 梁敬魁. R-site cation randomness effect in thec A-site ordered Y_0.5La_0.5BaMn₂O₆ compound[J]. 中国物理B, 2013, 22(7): 77502-077502.

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[J]. Chin. Phys. B, 2013, 22(7): 77502-077502.

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

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

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