Diverging giant magnetoresistance in ferromagnet-superconductor-ferromagnet trilayers

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

doi:10.1103/PhysRevB.78.094502

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Diverging giant magnetoresistance in ferromagnet-superconductor-ferromagnet trilayers

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

DOI 10.1103/PhysRevB.78.094502 · Physical Review B

T1

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Abstract

The relevance of pair-breaking by exchange and dipolar fields, and by injected spins in a low carrier density cuprate Y1−xPrxBa2Cu3O7 sandwiched between two ferromagnetic La2/3Sr1/3MnO3 layers is examined. At low external field (Hext), the system shows a giant magnetoresistance (GMR), which diverges deep in the superconducting state. We establish a distinct dipolar contribution to magnetoresistance (MR) near the switching field (Hc) of the magnetic layers. At Hext⪢Hc, a large positive MR, resulting primarily from the motion of Josephson vortices and pair breaking by the in-plane field, is seen.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y1-xPrxBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y0.6Pr0.4Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset