I-II-V族新型稀磁半导体研制及物性研究

项目名称： I-II-V族新型稀磁半导体研制及物性研究

项目编号： No.61306002

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 邓正

作者单位： 中国科学院物理研究所

项目金额： 26万元

中文摘要： 本项目申请人所在集体近期成功研制出基于I-II-V 族的新型稀磁半导体材料Li(Zn,Mn)As，实现了稀磁半导体中电荷和自旋的分别注入及调控，并且在体材料中得到了50K的铁磁转变温度。本项目计划在已有工作基础上，深入开展这个新材料体系的研制工作。研究重点为：探索LiZnAs类似系列的新型稀磁半导体材料，同时研制n型载流子诱导铁磁性的稀磁半导体；制备这些材料的单晶样品并进行物性研究（这是本项目的难点和重点）；利用在位高压、强磁场等极端条件下的物性表征手段，同时利用μSR、中子衍射、同步辐射等大科学装置来研究磁性质随载流子浓度和局域磁矩浓度的演化关系。最终目的是揭示稀磁半导体中电荷序与自旋序的物理效应并探索二者的调控机制，以理解稀磁半导体中铁磁性的起源。

中文关键词： 稀磁半导体；电荷与自旋分离；单晶生长；高压研究；

英文摘要： We has succeeded in synthesizing a new type of ferromagnetic diluted magnetic semiconductor (DMS) Li(Zn,Mn)As, based on a I-II-V semiconductor. In this material, charge and spin can be doped independently and the Curie temperature is up to 50K. In this project we plan to conduct several further works: (a)Synthesizing a series of new type of diluted magnetic semiconductors similar to LiZnAs and meanwhile searching for n type ferromagnetic DMS; (b)Growth and measurement of the single cystal of the above materials, which is the most difficult part of the project; (c)Researching the evolution of magnetism of DMS along with different carrier concentration and spin concentraion, by making use of in-site high pressure technique, high magnetic field measurement, muion spin relaxtion measurement, neutrion diffraction technique and sythcrotron radiaction X-ray diffraction technique. Based on the above studies, we will discover the control mechanism of charge order & spin order of DMS and then investigate the origin of magnetism in the dilute magnetic semiconductor.

英文关键词： Diluted magnetic semiconductor；decoupled charge and spin；single crystal growth；high-pressure research；