多连接高Tc NdBa2Cu3O7-d超导体中反常磁通量子化和偶极磁通态的形成
Anomalous flux quantization and formation of dipole-flux state in a multiply-connected high-Tc NdBa2Cu3O7-d superconductor
摘要：
利用高分辨扫描超导量子干涉仪（SQUID）显微镜研究了多连接各向异性高Tc NdBa 2Cu 3 O 7-d单晶薄膜中的磁通量子化现象。孔内磁通的空间分布被发现是不均匀的，并在施加小磁场时发生剧烈变化。与各向同性的铌超导体相比，随着磁场的增加，在10 μ T以上，孔内产生了局部磁偶极子通量。对于较大的空穴，俘获在空穴中的总净通量保持恒定，而对于较小的空穴，观察到通量量子化态的突变。根据高温超导体的各向异性dx 2-y2波序参量给出了可能的解释。
英文摘要：
High-resolution scanning superconducting quantum interference device (SQUID) microscopy was used to study the flux quantization phenomenon in multiply-connected anisotropic high-Tc NdBa2Cu3O7-d single crystalline thin films. The spatial distribution of internal flux in a hole was found to be non-uniform and changed drastically for applied small fields. With increased fields above 10uT, a local magnetic dipole flux developed inside the hole, in contrast to an isotropic Nb superconductor. The total net flux trapped in a hole was kept to be constant for larger holes, but the abrupt transition of flux quantization state was observed for smaller holes. The possible explanation is given based on the anisotropic dx2-y2-wave order parameter of high-Tc superconductors.
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