Magnetic properties of GdT4Al8 and GdT6Al6 compounds (T=Cr, Mn, Cu)

被引：24

作者：

Duong, NP ^{[1
]}

Klaasse, JCP ^{[1
]}

Brück, E ^{[1
]}

de Boer, FR ^{[1
]}

Buschow, KHJ ^{[1
]}

机构：

[1] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2001年 / 315卷 / 1-2期

关键词：

rare earth compounds; transition metal compounds; megnetically ordered materials; magnetic measurements; heat capacity;

D O I：

10.1016/S0925-8388(00)01288-3

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 have studied the magnetic properties of GdT4Al8 and GdT6Al6 compounds with T=Cr, Mn. Cu by means of standard magnetization and susceptibility measurements, magnetization measurements in high fields up to 35 T, and measurements of the specific heat. In these GdT4Al8 compounds, the T element does not carry a magnetic moment. In all these cases, the coupling between the Gd moments is fairly weak and leads to antiferromagnetic ordering at rather low temperatures. We have analyzed our data in terms of a simple mean-field two-sublattice model. Reliable values of the intersublattice coupling strength were derived from high-held measurements made on free powder particles. In the GdT,AI, compounds, more than one crystallographic site is occupied by the T elements, leading to relatively strong changes in the magnetic ordering temperatures. A comparison is made with the magnetic properties of GdFe4Al8 and GdFe6Al6 compounds in which the Fe moments strongly determine the magnetic properties. High-field measurements are presented also for the latter two compounds. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：28 / 35

页数：8

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