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三角晶格型化合物NaxCoO2(x=0.5)的电荷序和自旋序研究

发表时间:2013-08-15  浏览量:1458  下载量:589
全部作者: 王维华,魏安邦,罗晓光
作者单位: 南开大学信息技术科学学院
摘 要: 采用排除双占据的隶玻色子方法研究关联电子体系NaxCoO2在x=0.5时的电荷序和自旋序的序参量λc,λs随电子间相互作用的变化情况。研究结果表明:单纯的格点间库仑排斥作用(V)主要影响电荷序的序参量λc,而自旋交换作用(J)主要影响自旋序参量λs,电荷序和自旋序二者相互影响,大的J会导致强的自旋阻挫效应,从而使体系尽量表现为自旋有序形式;大的V使得电子尽量倾向于不均匀占据,即形成一定的电荷序。实验结果为进一步研究其反常的电子结构性质提供电荷、自旋有序相的序参量大小及NaxCoO2合理的电子间相互作用参数。
关 键 词: 凝聚态物理;三角晶格;隶玻色子方法;电荷序;自旋序
Title: Investigations on the charge ordering and spin ordering of NaxCoO2(x=0.5) with triangular lattice
Author: WANG Weihua, WEI Anbang, LUO Xiaoguang
Organization: College of Information Technical Science, Nankai University
Abstract: The dependence of the order parameters λc and λs of charge ordering and spin ordering on the interactions between electrons regarding the correlated electron system NaxCoO2, especially at x=0.5, by using the slave-boson approach which excludes the double occupation is investigated in this paper. It is found that λc is mainly affected by the inter-site Coulomb interaction (V) and λs is mainly decided by the spin exchange interaction (J). The charge ordering and spin ordering interact with each other. On the one hand, the spin frustration effect is enhanced by the large J, which leads to the spin ordering of system. On the other hand, the inhomogeneity results from the large V, which corresponds to charge ordering. Based on the experimental results, this work will provide the order parameters and the reasonable electron interaction parameters, which can be used for further study on the electronic structure of NaxCoO2.
Key words: condensed matter physics; triangular lattice; slave-boson approach; charge ordering; spin ordering
发表期数: 2013年8月第15期
引用格式: 王维华,魏安邦,罗晓光. 三角晶格型化合物NaxCoO2(x=0.5)的电荷序和自旋序研究[J]. 中国科技论文在线精品论文,2013,6(15):1399-1403.
 
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