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High bias anomaly in YBa₂Cu₃O7−x/LaMnO₃₊/YBa₂Cu₃O7−x superconductor/ferromagnetic insulator/superconductor junctions: Evidence for a long-range superconducting proximity effect through the conduction band of a ferromagnetic insulator

Golod, T. ; Rydh, A. ; Krasnov, V. M. ; Marozau, Ivan ; Uribe-Laverde, Miguel Angel ; Satapathy, Dillip Kumar ; Wagner, Th. ; Bernhard, Christian

In: Physical Review B, 2013, vol. 87, no. 13, p. 134520

We study the perpendicular transport characteristics of small superconductor/ferromagnetic insulator/superconductor (YBa₂Cu₃O7−x/LaMnO₃₊/YBa₂Cu₃O7−x) tunnel junctions. At a large bias voltage V∼1 V we observe a steplike onset of excess current that occurs below the superconducting transition temperature Tc and is easily suppressed by a...