无序CuZr和CuY合金的电阻和磁电阻(英文)  

ELECTRICAL RESISTANCE AND MAGNETORESISTANCE OF DISORDEREDCuZr AND CuY ALLOYS

作　　者：李燕飞[1] 桂太龙[1] 徐小龙[1] 

机构地区：[1]哈尔滨理工大学,哈尔滨150080

出　　处：《低温物理学报》2005年第4期289-297,共9页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:90207014)资助的课题~~

摘　　要：以熔化-旋转法制备了Cu70Zr30和Cu100-xYx( x = 28, 67)非晶带试样并在1～300 K温度范围内测量了电阻和磁电阻随温度变化的规律.非晶Cu70Zr30电阻率ρ(T)的温度系数(TCR)在整个测量温区内都是负值,并且在两个不同的温区表现出-T1/2行为.对于类似的Cu100-xYx合金系统,在1～200 K温区内也做了同类测量.在低温1～4 K, 两个不同的无序系统CuZr和CuY的 TCR都准确地表现出-T1/2行为,这表明无序系统在极低温条件下的量子相干效应.这主要应归因于在粒子-空穴通道的电子-电子相互作用.而无序Cu70Zr30在宽广的中低温区60～300 K以更大斜率表现出的-T1/2行为,可以用初始定域化理论解释.无序CuZr和CuY的低温磁电阻ρ(B,T)测量结果与定域化理论进行了拟合和讨论.Melt-spun ribbons of Cu70Zr30 and Cu100-xYx （x= 28,67） have been prepared and measured the temperature dependence of the electrical resistance, ρ（T）, in the range of 1～300 K. A negative temperature dependence of ρ（T） for Cu70Zr30 through the whole temperature range were found. - T^1/2 behaviors of the reduced resistivity are displayed in two ranges ot temperature. One of the -T^1/2dependence of the electrical resistivity in the range of 1 ～4 K may be mainly attributed to the electron-electron interaction in particle-hole channel, the other in the wide intermediate temperature range of 60～300 K can be accounted for by incipient localization. For the similar alloys of melt-spun Cu72Y28 and Ouaa Y67 ρ（T） in the range of 1 200 K were measured as a contrast. The interaction at low temperature is also identified in these two systems. Their temperature coefficients of ρ（T） have a change sign that was analyzed. The positive magnetoresistances p（B, T） of disordered Cu70Zr30 and CuY at a few different temperatures up to 20 K in the fields below 1.8T were also measured. The weak-localization is dominant in the ρ（B, T） of these alloys. The fittings of the ρ（B, T） data to the localization theory are discussed. It could be noticed that all the physical quantities such as p, TCR, MR and X are stronger for the Y-richer CuY alloys.

关 键 词：非晶态合金 磁电阻 电阻 无序系统 合金系统 电子相互作用 量子相干效应 低温区 温度系数 温度变化 

分 类 号：TG139.8[一般工业技术—材料科学与工程]