强磁场下(YBa_2Cu_3O_7)_(24)/(PrBa_2Cu_3O_7)_2多层膜的电阻转变展宽  

THE BROADENING OF RESISTIVE TRANSITION OF (YBa 2Cu 3O 7) 24 /(PrBa 2Cu 3O 7) 2 MULTILAYER IN HIGH MAGNETIC FIELD

作　　者：汪世界[1] 曹效文[1] 王胜[1] 王福堂[1] 陈敬林[1] 李可斌[2] 王智河[3] 

机构地区：[1]中国科学院等离子体物理研究所强磁场实验室 [2]中国科学院固体物理研究所 [3]中国科学院上海冶金研究所

出　　处：《低温物理学报》1998年第4期293-297,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金

摘　　要：本文研究了不同磁场位形下（ＹＢａ２Ｃｕ３Ｏ７）２４／（ＰｒＢａ２Ｃｕ３Ｏ７）２多层膜的电阻转变展宽，结果表明电阻转变展宽性质主要由磁场和多层膜ｃ轴的相对位形决定，而与磁场和所加电流的相对取向无关．有效钉扎势和磁场的关系表明，Ｈ∥ａｂ时，Ｕ０∝Ｈ－α，Ｈ∥ｃ时，Ｕ０∝ｌｎＨ．这种三维二维（３Ｄ２Ｄ）转变，可以归因于ＹＢＣＯ／ＰｒＢＣＯ叠层中的ＰｒＢＣＯ和ＹＢＣＯ层厚度处于３Ｄ２Ｄ转变厚度范围所致．Abstract The broadening of resistive transition of (YBa 2Cu 3O 7) 24 /(PrBa 2Cu 3O 7) 2 multilayer were measured in detail in high magnetic field for different configurations. It is found that the broadening of resistive transition was mainly determined by the orientation of magnetic field with respect to c axis of multilayer rather than the direction of transport current. The magnetic field dependence of the activation energy showed that, U 0∝H -α for H∥ab and U 0 ∝ln H for H∥c . This crossover from three dimension(3 D ) to two dimension(2 D ) may be attributed to the thickness of YBCO and PrBCO layers are in the range of thickness which induce a dimensional crossover.

关 键 词：YBCO PBCO 超导体 多层膜 电阻转变展宽 

分 类 号：TM262.014[一般工业技术—材料科学与工程]