物理学报Issue(12)：1-5,5.DOI:10.7498/aps.63.127501
La（Fe,Si）13化合物的居里温度机制
Curie temp erature mechanism in La(Fe,Si)13 comp ound
摘要
Abstract
In NaZn13 type La(Fe,Si)13 compound, the phase transition nature varies from the first order to the second order, the cell volume contracts, the saturated magnetization decreases and the Curie temperature increases with increasing Si content. In this paper, the relation between the Curie temperature and the cell volume is investigated systematically by introducing the interstitial carbon atoms, which is an efficient method to control the cell volume and the Curie temperature. It is found that the relation between the Curie temperature and the cell volume is consistent with the Jaccarino-Walker model, in which only 5% or less 3d electrons are considered as the itinerant electrons and the others are regarded as the localized ones. With the polarized itinerant electrons used as a medium, the interaction between the 3d localized electrons is similar to Ruderman-Kittel-Kasuya-Yosida interaction, whose sign and magnitude oscillate periodically with distance. The number of the itinerant electrons of the La (Fe,Si)13 increases with the increase of Si content. The Curie temperature is dependent on both the cell volume and the number of itinerant electrons.关键词
磁性/居里温度Key words
magnetic properties/Curie temperature引用本文复制引用
王芳,汪金芝,冯唐福,孙仁兵,余盛..La（Fe,Si）13化合物的居里温度机制[J].物理学报,2014,(12):1-5,5.基金项目
国家自然科学基金(批准号:11204147,51371185)、浙江省自然科学基金(批准号：LY13A040002)、宁波市自然科学基金(批准号:2013A610130)和宁波工程学院校基金资助的课题.@@@@Project supported by the National Natural Science Foundation of China (Grant Nos.11204147,51371185), the Natural Science Foundation of Zhejiang Province, China (Grant No. LY13A040002), the Ningbo Natural Science Foundation, China (Grant No.2013A610130), and the Research Foundation from Ningbo University of Technology, China （批准号:11204147,51371185）
