Zn掺杂对1/2 S自旋梯状结构化合物Sr_(14)Cu_(24)O_(41)磁性质的影响  

B-SITE Zn DOPING EFFECT ON THE MAGNETIC PROPERTIES OF QUASI-ONE-DIMENSIONAL SPIN LADDER COMPOUND Sr_(14)Cu_(24)O_(41)

作　　者：谢卉[1] 胡妮[1] 汪丽莉[1] 林颖[1] 熊锐[1] 余祖兴[1] 汤五丰[1] 王取泉[1] 石兢[1] 王永强[2] 袁松柳[2] 

机构地区：[1]武汉大学物理科学与技术学院,武汉430072 [2]华中科技大学物理系,武汉430074

出　　处：《低温物理学报》2006年第3期201-205,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:10474074和10534030)资助的课题~~

摘　　要：利用固相反应法制备了Sr14Cu24O41和Sr14(Cu0.99Zn0.01)24O41的样品,X-ray衍射分析显示,样品呈较纯的单相,样品的晶格常数掺杂前后并无明显变化.测量了S=0的非磁性元素Zn部分替代S=1/2的B位Cu离子后体系低温磁性质的变化.曲线整体拟合结果表明掺Zn使得体系中居里外斯部分的贡献减少,并且由Zn引入的局域磁矩通过近邻的自旋单态与次近邻的Cu2+进行超交换相互作用形成二聚体,使系统内二聚体的个数增加并且二聚体的耦合能减小.The samples of Sr14 Cu24 O41 and Srt4 （Cu0.99Zn0.01）24 O41 were prepared by conventional solid-state reaction and identified to be single phase. No obvious change of lattice parameters a,b,c is found by the analyses of X-ray diffraction. Magnetic susceptibility measurements exhibit the change of magnetic properties at low temperature when Cu ions are partially substituted by the nonmagnetic ions Zn with S = 0. The experimental data are well fitted and the fitting constants show that Zn doping decreases the contribution of Curie-Weiss term, and the local moments induced by nonmagnetic ions Zn interact with the next nearest Cu^2＋ spins via the nearest nonmagnetic ZR singlet to form a dimer. The number of the dimer increases while the energy of intradimer coupling decreases after Zn doping.

关 键 词：自旋梯状结构化合物 晶体结构 磁性质 二聚化 

分 类 号：O482.5[理学—固体物理] TN305.3[理学—物理]