SPIN-GLASS BEHAVIOR OF ICOSAHEDRAL MG-GD-ZN AND MG-TB-ZN QUASI-CRYSTALS

被引：57
|
作者：
HATTORI, Y
NIIKURA, A
TSAI, AP
INOUE, A
MASUMOTO, T
FUKAMICHI, K
ARUGAKATORI, H
GOTO, T
机构：
[1] TOHOKU UNIV, INST MAT RES, SENDAI, MIYAGI 98077, JAPAN
[2] UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 1995年 / 7卷 / 11期
关键词：
D O I：
10.1088/0953-8984/7/11/009
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The magnetic properties of icosahedral Mg(42)RE(8)Zn(50) (RE = Gd, Tb, Dy, Ho or Er) quasi-crystals have been investigated. These quasi-crystalline phases have a face-centred icosahedral lattice with a highly ordered Frank-Kasper-type structure as identified by electron diffraction and x-ray diffraction. The temperature dependence of Dc magnetic susceptibility obeys a Curie-Weiss law in wide temperature ranges. The effective magnetic moments mu(eff) are close to those of free RE(3+) ions and their paramagnetic Curie temperature Theta(p) is negative, indicating that the RE-RE exchange interactions are predominantly antiferromagnetic. The value of Theta(p) which is the sum of all exchange interactions is almost in proportion to the de Gennes factor. At low temperatures, spin-glass behaviour has been observed in the icosahedral Mg42Gd8Zn50 and Mg42Tb8Zn50 quasi-crystals and their spin freezing temperatures T-f are 5.5 K and 7.6 K, respectively.
引用
收藏
页码：2313 / 2320
页数：8
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