Magnetic structure of the quasi-two-dimensional compound CoTa2O6

被引：15
|
作者：
Kinast, E. J. [2 ]
dos Santos, C. A. [3 ]
Schmitt, D. [4 ]
Isnard, O. [1 ]
Gusmao, M. A. [3 ]
da Cunha, J. B. M. [3 ]
机构：
[1] Univ Grenoble 1, CNRS, Inst Neel, F-38042 Grenoble 9, France
[2] Univ Estadual Rio Grande do Sul, BR-90010191 Porto Alegre, RS, Brazil
[3] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
[4] Univ Grenoble 1, Lab Geophys Interne & Tectonophys, F-38041 Grenoble 9, France
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 491卷 / 1-2期
关键词：
Two-dimensional magnetism; Trirutile; Neutron diffraction; FETA2O6; NITA2O6;
D O I：
10.1016/j.jallcom.2009.10.241
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report on a detailed investigation of magnetic properties of CoTa2O6 using several techniques: neutron and X-ray diffraction, specific-heat, magnetic susceptibility, and magnetization measurements. The compound shows quasi-two-dimensional behavior due to its layered structure of alternating Co-O and Ta-O planes. We find that all magnetic moments lie entirely in the Co-O planes, along easy axes determined by the orientations of oxygen octahedra that surround the Co ions. The easy axes in successive magnetic planes have relative orientations that differ by 90 degrees. Antiferromagnetic ordering is observed below 6.6 K, with propagation vectors (+/-1/4,1/4,1/4) associated to the two non-equivalent sets of Co2+ ions, whose magnetic moments are perpendicularly oriented. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：41 / 44
页数：4
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