在绝缘导电间隔极限下的发散巨磁电阻效应
Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer
摘要：
交换和偶极场，并通过注入自旋在低载流子密度的铜酸盐Y $_{1-x}$ Pr $_x$ Ba $_2$ Cu $_3$ O $_7$夹在两个铁磁La $_{2 / 3}$ Sr $_{1 / 3}$ MnO $_{3}$层之间的相关性进行检查。在低外场（$H_{ext}$）下，系统表现出巨磁电阻（MR），在超导状态下，MR向深部发散。我们建立了一个独特的偶极MR附近的磁层的开关场（H $_c$）的贡献。在H $_{ext} \gg$ H $_c$处，可以看到主要由面内场引起的约瑟夫森涡旋运动和对断裂导致的大的正MR。
英文摘要：
The relevance of pair-breaking by exchange and dipolar fields, and by injected spins in a low carrier density cuprate Y$_{1-x}$Pr$_x$Ba$_2$Cu$_3$O$_7$ sandwiched between two ferromagnetic La$_{2 / 3}$Sr$_{1 / 3}$MnO$_{3}$ layers is examined. At low external field ($H_{ext}$), the system shows a giant magnetoresistance(MR), which diverges deep in the superconducting state. We establish a distinct dipolar contribution to MR near the switching field(H$_c$) of the magnetic layers. At H$_{ext} \gg$ H$_c$, a large positive MR, resulting primarily from the motion of Josephson vortices and pair breaking by the in-plane field, is seen.
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