Drastic anion substitution effect in deformed pyrochlore lattice Co2(OH)3Cl1-xBrx

被引：8
|
作者：
Hagihala, Masato [1 ]
Zheng, X. G. [1 ,2 ]
Kawae, Tatsuya [3 ]
机构：
[1] Saga Univ, Sch Engn, Dept Phys, Saga 8408502, Japan
[2] Saga Univ, Fac Sci & Engn, Dept Phys, Saga 8408502, Japan
[3] Kyushu Univ, Fac Engn, Dept Appl Quantum Phys, Fukuoka 8128581, Japan
来源：
PHYSICA B-CONDENSED MATTER | 2009年 / 404卷 / 5-7期
关键词：
Geometrical frustration; Co-2(OH)(3)Cl1-xBrx; Spin fluctuation; Distorted tetrahedron; Substitution;
D O I：
10.1016/j.physb.2008.11.101
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
As a part of an extensive study of the new geometric frustration series M-2(OH)(3)X (M: 3d magnetic ion; X: halogen ion) on deformed pyrochlore lattice we have investigated in detail the magnetism of Co-2(OH)(3)Cl1-xBrx, in which the magnetic state was found to be very sensitive to the anion substitution. Co-2(OH)(3)Br was found to undergo anti ferromagnetic transitions at T-N1 = 6.2 K and T-N2 = 4.8 K, respectively, which are contrasting as compared to the partial ferromagnetic state in Co-2(OH)(3)Cl. Muon spin precession was observed with additional fast relaxation below T-N1, implying coexisting spin-fluctuation. Meanwhile, the partially substituted Co-2(OH)(3)Cl1-xBrx transforms from ferromagnetic to anti ferromagnetic by increasing the x ratio. The present work presents a unique system to investigate the critical role of the tetrahedral, distortion in geometric frustration. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：671 / 673
页数：3
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