YBa_2Cu_3O_(7-δ)外延薄膜的不可逆线与磁通玻璃线  

RELATION BETWEEN IRREVERSIBILITY LINE AND VORTEX GLASS LINE IN EPITAXIAL YBa 2Cu 3O 7 δ THIN FILMS 

作　　者：王智河[1] 曹效文[2] 方军[2] 陈治友[2] 李可斌 

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

出　　处：《物理学报》1999年第1期154-162,共9页Acta Physica Sinica

基　　金：国家超导技术联合研究开发中心(批准号:95预069703)部分资助

摘　　要：在０—１０Ｔ磁场范围内，系统地测量了ＹＢａ２Ｃｕ３Ｏ７δ外延薄膜处于磁场平行和垂直膜面两种情况下的ＲＴ曲线和ＩＶ曲线，并对该样品的不可逆线和磁通玻璃线作了直接的比较．结果表明，由不同约化电阻率判据给出的不可逆线和磁通玻璃线遵守相同的Ｈ∝（Ｔ（０）－Ｔ（Ｈ））ｎ关系．对于不可逆线，ｎ＝３／２，对于磁通玻璃线，ｎ＝４／３．不可逆线的位置不仅与判据有关而且与测量电流密度也有关，磁通玻璃线位于不可逆线的下方．探讨了磁通玻璃线与不可逆线间的关系．Abstract We have measured in detail the resistive transition and the isothermal current voltage curves in the case of applied magnetic field parallel and perpendicular to the surface of the film up to 10T for an epitaxial YBa 2Cu 3O 7 δ thin film, respectively. The comparative study of the irreversibility line from the R T curves with the vortex glass line from the I V curves was made. The results showed that the irreversibility line determined from the different reduced resistivity criterion and vortex glass line follow the same power law, H∝(T(0)-T(H)) n , and n=4/3 for the vortex glass line, n =3/2 for the irreversibility line. The irreversibility line is dependent not only on the different reduced resistivity criterion but also on the measuring current density. The vortex glass line lies below the irreversibility line. The possible origin of the difference between such two lines was discussed.

关 键 词：不可逆线 磁通玻璃线 YBCO 外延薄膜 

分 类 号：TM262.014[一般工业技术—材料科学与工程]