Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer

Soumen Mandal; R. C. Budhani; Jiaqing He; Y. Zhu

doi:10.1103/PhysRevB.78.094502

paper

Diverging Giant Magnetoresistance in the Limit of Infinitely Conducting Spacer

arXiv:0806.3862 · doi:10.1103/PhysRevB.78.094502

Abstract

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 ( $H_{e x t}$ ), 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 $_{e x t} ≫$ H $_{c}$ , a large positive MR, resulting primarily from the motion of Josephson vortices and pair breaking by the in-plane field, is seen.

12 pages, 5 figures

References in corpus (2)

A spin triplet supercurrent through the half-metallic ferromagnet CrO2
Correlation between incoherent phase fluctuations and disorder in Y $_{1 - x}$ Pr $_{x}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - δ}$ epitaxial films from Nernst effect measurements

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