Nonequilibrium superconductivity under spin-polarized quasiparticle currents in perovskite ferromagnet-insulator-superconductor heterostructures
N.-C. Yeh, R. P. Vasquez, C. C. Fu, A. V. Samoilov, Y. Li, K. Vakili
DOI 10.1103/PhysRevB.60.10522 · Physical Review B
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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 Jc, 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 Jc is observed under small injection currents Im from the ferromagnet, followed by a strong suppression of Jc under large Im. In contrast, no effect of injection on Jc 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84.2 | Pressure not reported | unknown |
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