Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer

Details Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer

2008-06-24

arxiv.org/abs/0806.3862v1

Phys. Rev. B 78, 094502 (2008)

Physics

Condensed Matter

Superconductivity

12 pages, 5 figures

Scientific paper

10.1103/PhysRevB.78.094502

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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