OBSERVATION OF ANISOTROPIC PINNING EFFECT IN BI2SR2CACU2O8+DELTA SINGLE-CRYSTALS

被引：25

作者：

KAWAMATA, S ^{[1
]}

TOH, N ^{[1
]}

OKUDA, K ^{[1
]}

MOCHIKU, T ^{[1
]}

KADOWAKI, K ^{[1
]}

机构：

[1] NATL RES INST MET,TSUKUBA LABS,TSUKUBA,IBARAKI 305,JAPAN

来源：

PHYSICA C | 1992年 / 195卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90080-V

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The anisotropic pinning effect of magnetic flux lines in Bi2Sr2CaCu2O8+delta single crystals was investigated by torque measurements in a temperature range from 4.2 to 100 K. A sharp cusp in angular dependence of the torque was found near H(parallel-to) ab-plane between 15 and 82 K. The magnetic field dependence of the angle yielding the cusp theta(cl) is clearly determined by the field component perpendicular to the CuO2 planes H(cP1) obeying Hcos theta(cl)=H(cP1), revealing thc intrinsic flux trapping between the CuO2 planes and the start of the stepwise penetration at H(cP1). In addition, extra cusps were observed in the torque curves in a narrow temperature range from 21 to 40 K, suggesting a certain change in the vortex state. The relation between fields and angles to give extra CUSPS theta(c2) also well fitted the equation Hcos theta(c2)= H(cP2). The temperature dependence of H(cP1) and H(cP2) was determined and the phase transition of the vortex state is discussed.

引用

页码：103 / 108

页数：6

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