YBa_2(Cu_(1-x)Sn_x)3O_(7-y)超导体的磁弛豫和钉扎  

MAGNETIC RELAXATION AND FLUX PINNING OF YBa_2(Cu_(1-x)Sn_x)_3O_(7_y) SUPERCONDUCTOR

作　　者：金新[1] 范宏昌 张贻瞳 鹿牧[1] 徐小农[1] 沈剑沧[1] 姚希贤[1] 

机构地区：[1]南京大学物理系,南京210008

出　　处：《低温物理学报》1992年第3期196-200,共5页Low Temperature Physical Letters

基　　金：国家超导中心;中国科学技术大学结构分析开放实验的资助

摘　　要：我们制备了一组 YBa_2(Cu_(1-x)Sn_x)_3O_(7-y)多晶超导样品,在77K 时测量了它们的磁滞回线和增场磁弛豫率,计算了它们的钉扎势 U_0结果表明,在相同制备工艺条件下,掺锡样品的钉扎势比不掺锡(x=0)样品的高.结合 TEM、X-射线衍射和喇曼谱分析结果,我们认为YBa_2Cu_3O_(7-y)超导体中的位错不是主要钉扎中心,掺锡样品中的β-Sn 正常粒子可能是有效的钉扎中心.We have prepared a series of the polycrystal superconducting samples YB2 (Cu1-xSnx)3O7-y At 77K, their magnetic hysteresis loops and magnetic relaxation rate with field increasing were measured. The calculating results show that the pinning potential Uo in Sn-doped samples is higher than the undoped samples. Combining with TEM, X-ray diffraction and Raman spectrum analysis, we consider that the dislocations in YBa2Cu3O7-y superconductor are not the main pinning centers and the normal grain β-Sn may be the effective pinning center in Sn-doped samples.

关 键 词：超导体 氧化物 磁驰豫 磁通钉扎 

分 类 号：O511.1[理学—低温物理]