Abstract
We report phenomena manifesting nonequilibrium superconductivity induced by spin-polarized quasiparticles in perovskite ferromagnet-insulator-superconductor (F-I-S) heterostructures. Measurements of the critical current ${J}_{c},$ using a pulsed current technique to minimize Joule heating, reveal a monotonic increase with increasing insulator thickness; and for F-I-S with thin insulating barriers, a slight increase in ${J}_{c}$ is observed under small injection currents ${I}_{m}$ from the ferromagnet, followed by a strong suppression of ${J}_{c}$ under large ${I}_{m}.$ In contrast, no effect of injection on ${J}_{c}$ can be detected in the N-I-S control sample (N: nonmagnetic metal). The spin diffusion time and length in cuprate superconductors are also estimated and compared with our experimental results.
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