Spin-dependent magnetoresistance of ferromagnet/superconductor/ferromagnet La0.7Ca0.3MnO3∕YBa2Cu3O7−δ∕La0.7Ca0.3MnO3 trilayers

C. Visani; V. Peña; J. Garcia-Barriocanal; D. Arias; Z. Sefrioui; C. Leon; J. Santamaria; N. M. Nemes; M. Garcia-Hernandez; J. L. Martinez; S. G. E. te Velthuis; A. Hoffmann

doi:10.1103/PhysRevB.75.054501

Spin-dependent magnetoresistance of ferromagnet/superconductor/ferromagnet La0.7Ca0.3MnO3∕YBa2Cu3O7−δ∕La0.7Ca0.3MnO3 trilayers

C. Visani, V. Peña, J. Garcia-Barriocanal, D. Arias, Z. Sefrioui, C. Leon, J. Santamaria, N. M. Nemes, M. Garcia-Hernandez, J. L. Martinez, S. G. E. te Velthuis, A. Hoffmann

DOI 10.1103/PhysRevB.75.054501 · Physical Review B

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Abstract

We report on large magnetoresistance in ferromagnet/superconductor/ferromagnet trilayer structures made of La0.7Ca0.3MnO3 and YBa2Cu3O7. We find that the shape and height of the magnetoresistance peaks are not modified when the relative orientation of current and magnetic field is changed from parallel to perpendicular. Furthermore, we find that the temperature shift of the resistance curves is independent of current and of the sweep rate of the magnetic field. These observations favor the view that the magnetoresistance phenomenon originates in the spin dependent transport of quasiparticles transmitted from the ferromagnetic electrodes into the superconductor, and rule out interpretations in terms of spontaneous vortices or anisotropic magnetoresistance of the ferromagnetic layers.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	57	Pressure not reported	onset