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熔融织构YBa2Cu3O7-δ晶体中磁通涡旋锁定转变反常行为研究?
Abnormal b ehaviors in lo ck-in transition of the vortices in melt textured growth of YBa2Cu3O7-δ crystals
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摘要: 通过改变磁场与c轴方向夹角测量了熔融织构YBa2Cu3O7?δ(YBCO)晶体的磁力矩信号响应，观察到了磁通涡旋系统的锁定(lock-in)转变行为以及锁定转变角正比于外磁场强度的反常现象。基于Ginzburg-Landau理论和磁通涡旋线Kink结构模型，对上述锁定转变反常现象进行了分析讨论，提出了熔融织构YBCO晶体中存在平行于a-b面的延展性关联缺陷结构假设，导出了锁定转变临界角与温度和磁场之间的关系，理论分析模型结果与实验测量结果基本符合。
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关键词:
- YBa2Cu3O7-δ单畴晶体 /
- 磁通涡旋结构 /
- 锁定转变
Abstract: The magnetization behavior of the layered anisotropic high-Tc superconductor in the mixed state Hc1In this paper, we systematically measure the magnetic torque signal in melt texture growth YBCO (MTG-YBCO) bulk and observe an abnormal lock-in transition behavior in the vortex system. The critical angle of the lock-in transition is found to be directly proportional to the strength of the magnetic field, which is contrary to the observations in the common cases. According to the framework of the Ginzburg-Landau theory and the kink structure model of the vortex line, we discuss the abnormal phenomenon, and propose that there is a type of extend-correlated defect structure, which is parallel to the a-b plane, in the MTG-YBCO crystal. The relationship between the critical angle of the lock-in transition to the temperature and the magnetic field is established theoretically, and the theoretical results coincide well with the torque measurements. -
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