(1-x)La_(0.67)Ca_(0.33)MnO_3/xCuO复合体系与La_(0.67)Ca_(0.33)Mn_(1-x)Cu_xO_3电输运行为比较

用不同实验方法制备了名义组分为（1-x）La0.67Ca0.33MnO3/xCuO（LCMO/CuO）和La0.67Ca0.33Mn1-xCuxO3（LCMCO）两组样品,在宽的温度范围内研究了样品的电输运行为随Cu含量x的变化关系,发现这两组样品表现出不同的行为。对于LCMCO,随x的增加,金属-绝缘体转变温度Tp迅速降低,当x=5.5%,样品表现出绝缘体导电行为;而LCMO/CuO复合样品,当x≤6%时,随x增加,Tp逐渐下降,x≥6%时,Tp不再继续降低,所有样品几乎表现出相同的电输运行为。另外,这两组样品均表现出较好的低场磁电阻效应（LFMR）,在0.3 T下样品的最大磁电阻分别达到了~76%和88%。基于样品结构以及制备过程的分析,我们认为LFMR效应的增强主要是因为颗粒边界上形成的Cu相关自旋无序层引起的。

J_1-J_2团簇的数值模拟研究

采用严格对角化方法计算了由几十个格点自旋构成的量子自旋团簇的基态总自旋 .在无阻挫情形 ,基态总自旋并不等于团簇的最低可能总自旋 ,而是取一个较大的值 .这意味着即使对于具有纳米尺寸的团簇 ,量子涨落也不破坏基态的经典奈尔序 .若在团簇中引入阻挫 ,则将诱导从奈尔序到自旋无序的量子相变 ,该相变可以通过基态总自旋的变化进行描述和标记 .计算表明 ,由于在相变点存在能级交错 ,故该量子相变应该是一级相变 .从团簇的数值计算结果可以推断 :对于二维无限 J1-J2 模型 ,临界点在 J2 / J1=0 .3 762 (± 0 .0 0 0 2 )处 .这一结果比以前的解析近似研究和有限系统标度分析的结果更为精确 .

Spin—Dependent Scattering Effects and Dimensional Crossover in a Quasi—Two—Dimensional Disordered Electron System

Two kinds of spin-dependent scattering effects (magnetic-impurity and spin-orbit scatterings) are investigated theoretically in a quasi-two-dimensional (quasi-2D) disordered electron system. By making use of the diagrammatic techniques in perturbation theory, we have calculated the dc conductivity and magnetoresistance due to weak-localization effects, the analytical expressions of them are obtained as functions of the interlayer hopping energy and the characteristic times: elastic, inelastic, magnetic and spin-orbit scattering times. The relevant dimensional crossover behavior from 3D to 2D with decreasing the interlayer coupling is discussed, and the condition for the crossover is shown to be dependent on the aforementioned scattering times. At low temperature there exists a spin-dependent-scattering-induced dimensional crossover in this system.