Tl_2Ba_2Ca_2Cu_3O_y大块超导体的磁化和钉扎势  

MAGNETIZATION AND PINNING POTENTIAL OF MAGNETICFLUX FOR Tl_2Ba_2Ca_2Cu_3O_y BULK SUPERCONDUCTOR

作　　者：曹效文[1] 冯尚申[1] 许小军 方军 

机构地区：[1]中国科学院等离子体物理研究所,浙江省台州师专物理系

出　　处：《低温物理学报》1994年第3期204-207,共4页Low Temperature Physical Letters

摘　　要：研究了Ｔｌ２Ｂａ２Ｃａ２Ｃｕ３Ｏｙ大块超导体的磁化和磁通钉扎势．由ＺＦＣ磁化测量发现，在远低于Ｔｃ的温度发生２Ｄ－３Ｄ转变．由磁驰豫确定的磁通钉扎势Ｕｐ与磁场之间遵守Ｕｐ∝Ｈ－ａ，且ａ≈１．在Ｈ＜Ｈｃ１磁场范围内，弱连接超导体的钉扎势则遵守Ｕｐ∝ｅｘｐ［－Ｈ／Ａ］关系，且Ａ＝６０．AbstractMagnetization and pinning potential of magnetic flux for Tl2Ba2Ca2Cu3oy bulk superconductor were studied. It was found from ZFC magnetizationmeasurement that the 2D-3D transinon occurs at a temperature muchlower than Tc. Magnetic field dependence of the pinning potential offlux follows Up ∝ H-a, and a≈1. Within magnetic field range of H<Hcl, the pinning potential of weak link superconductor follows Up ∝ exp[-H/a] with A=60.

关 键 词：超导体 铊系 磁化 磁通钉扎势 

分 类 号：O511.1[理学—低温物理]