SUPERWEAK FERRIMAGNETISM ARISING FROM STRONG-COUPLING IN PARAMAGNETIC SYSTEMS

被引：14

作者：

NEUMANN, KU ^{[1
]}

LIPINSKI, S ^{[1
]}

ZIEBECK, KRA ^{[1
]}

机构：

[1] POLISH ACAD SCI,INST MOLEC PHYS,PL-60179 POZNAN,POLAND

来源：

SOLID STATE COMMUNICATIONS | 1994年 / 91卷 / 06期

关键词：

Heusler alloys - Landau theory - Paramagnetic systems - Superweak ferrimagnetism;

D O I：

10.1016/0038-1098(94)90782-X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Alloys are considered which can be thought of as being composed of two strongly coupled paramagnetic subsystems. Using Landau theory it is shown that when a magnetic coupling of sufficient strength is switched on between the paramagnetic subsystems the whole system becomes unstable towards a magnetically ordered state. It is shown that for a positive coupling constant a ferrimagnetic state results with a small ferromagnetic moment. For small external magnetic fields the ferromagnetic component is only weakly field and temperature dependent. The relevance of this model for the interpretation of superweak ferrimagnetism recently observed in some Heusler alloys is briefly discussed.

引用

页码：443 / 446

页数：4