层状3d过渡金属化合物的载流子调制探索

项目名称： 层状3d过渡金属化合物的载流子调制探索

项目编号： No.11474339

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 任治安

作者单位： 中国科学院物理研究所

项目金额： 80万元

中文摘要： 过渡金属元素化合物常具有非常复杂的电子结构，对其进行载流子调制可以显示出丰富的新颖物理现象，典型如高温超导、巨磁阻效应等。对于新超导材料的探索是凝聚态物理中的一个重要研究方向。目前已发现的两种高温超导体系即铜氧化物和铁基超导体均为3d过渡元素Cu和Fe起主要贡献，均为层状的准二维晶体结构，并且均由载流子调制实现超导。本项目拟对铜铁之外的其它3d元素形成的典型的层状化合物进行系统的载流子调制探索研究。这些3d元素多具有可变的化合价，具有很好的晶格匹配能力，可与碳氮氧族等非金属形成多种层状结构化合物。本项目将主要研究由这些3d元素形成的二元层状结构单元与其它层状单元堆叠而成的晶体结构，通过不等化合价的元素掺杂、离子插层等方式引入载流子并进行调制，对其载流子掺杂相图进行系统研究并总结规律，以期发现新的高温超导体或者新量子现象。

中文关键词： 高温超导；过渡金属化合物；强关联体系；载流子浓度；材料合成

英文摘要： The electronic structures of transition metal compounds are usually very complicated, and novel physical phenomena may appear by carrier modulation in them, such as high temperature superconductivity, giant magneto resistance effect etc. The exploration for new superconductor is one of the most important fields in condensed matter physics. In the two discovered high temperature superconducting family of copper oxides and iron pnictides superconductors, the superconductivity both comes from the 3d elements of Cu and Fe, the crystal structures are both layered quasi 2-dimensional, and superconductivity are both achieved by carrier modulation . In this project we will systematically study the carrier modulation effect on layered compounds formed with 3d elements except Cu and Fe. These 3d elements usually have alterable valences, with good lattice match ability, and can form diverse layered structural compounds with non-metallic elements such as C, N, O family elements. We will mainly study the binary layered structural units formed by these 3d elements which compose crystals with other layered units, the methods of elemental substitution with unequal valence and ion intercalation will be used for carrier modulation, the carrier doping phase diagram will be systematically studied to obtain some physical regularity, in order to discover new high temperature superconductivity or new quantum phenomena.

英文关键词： high-Tc superconductivity;transition metal compound;strongly correlated system;carrier concentration;material synthesis