Destruction of magnetic ordering in "112" LnBaCo2O5.50±δ by calcium doping

被引：9
作者：
Seikh, Md. Motin [1 ,2 ]
Caignaert, V. [2 ]
Pralong, V. [2 ]
Raveau, B. [2 ]
机构：
[1] Visva Bharati Univ, Dept Chem, Santini Ketan 731235, W Bengal, India
[2] CNRS, ENSICAEN, CRISMAT, UMR 6508, F-14050 Caen, France
来源：
SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 17-18期
关键词：
Ferromagnetic; Antiferromagnetic; Metal-insulator transition; Phase separation; METAL-INSULATOR-TRANSITION; SPIN-STATE TRANSITION; LAYERED COBALTITES; SINGLE-CRYSTAL; TBBACO2O5.5; PEROVSKITE; PHASES; GD; DY;
D O I：
10.1016/j.ssc.2009.02.012
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The effect of calcium doping upon the magnetic and transport properties of the smaller size lanthanide cobaltites of the type Ln(1-x)Ca(x)BaCo(2)O(5.50+delta) (Ln = Dy and Ho) has been investigated for 0 <= x <= 0.2. The substitution of Ln by calcium induces a large deterioration of the long-range magnetic ordering in the system finally leading to a paramagnetic state. Such instability in the magnetic ordering could be related to strong bending of the Co-O-Co bond, the local lattice distortion and the random vacancies in oxygen sublattice. The present results suggest that not only the cobalt valence but also the size of the lanthanide and the local lattice distortion play a crucial role in determining the physical properties of this layered cobaltite. (C) 2009 Elsevier Ltd. All rights reserved.
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收藏
页码：697 / 702
页数：6
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