Abstract
We study the perpendicular transport characteristics of small superconductor/ferromagnetic insulator/superconductor (YBaCuO/LaMnO/YBaCuO) tunnel junctions. At a large bias voltage V we observe a steplike onset of excess current that occurs below the superconducting transition temperature and is easily suppressed by a magnetic field. The phenomenon is attributed to a different type of the superconducting proximity effect of nonequilibrium electrons injected into the conduction band of the ferromagnetic insulator via a Fowler-Nordheim tunneling process. The occurrence of a strongly nonequilibrium population is confirmed by the detection of photon emission at large bias voltage. Since the conduction band in our ferromagnetic insulator is strongly spin polarized, the long range (20 nm) of the observed proximity effect provides evidence for an unconventional spin-triplet superconducting state.
- Received 18 September 2012
DOI:https://doi.org/10.1103/PhysRevB.87.134520
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