Successive phase transitions in a metal-ordered manganite perovskite YBaMn2O6

被引:75
作者
Nakajima, T [1 ]
Kageyama, H [1 ]
Ueda, Y [1 ]
机构
[1] Univ Tokyo, Inst Solid State Phys, Mat Design & Characterizat Lab, Kashiwa, Chiba 2778581, Japan
关键词
oxides; crystal structure; electrical properties; magnetic properties; phase transitions;
D O I
10.1016/S0022-3697(02)00117-8
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Structural, magnetic and electric properties of a metal-ordered perovskite YBaMn2O6 have been studied by means of powder X-ray diffraction, differential scanning calorimetric, magnetic susceptibility, and electric resistivity. It is found that this material undergoes a first-order structural phase transition at T-cl = 520 K, from a pseudo orthorhombic (monoclinic) phase (T-cl < T) to a pseudo tetragonal (monoclinic) one (T < T-cl). Accompanied by this transition the susceptibility exhibits a sharp drop where ferromagnetic exchange interaction becomes antiferromagnetic. Furthermore, two more transitions, a metal-insulator transition at T-c2 = 480 K and an antiferromagnetic ordering at T-c3 = 200 K, have been observed, respectively. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:913 / 916
页数:4
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