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arXiv · 1701.05364

Spin-filtering in superconducting junction with the manganite interlayer

G. A. Ovsyannikov·K. Y. Constantinian·V. V. Demidov·Yu. V. Kislinskii·A. V. Shadrin·A. M. Petrzhik
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Abstract

We report on the electronic transport and the impact of spin-filtering in mesa-structures made of epitaxial thin films of cuprate superconductor YBa2Cu3Ox(YBCO) and the manganite LaMnO3 (LMO) interlayer with the Au/Nb counterelectrode. Ferromagnetic resonance measurements of heterostructure Au/LMO/YBCO shows ferromagnetic state at temperatures below 150 K as in the case of reference LMO film grown on the neodymium gallate substrate. The heights of the tunneling barrier evaluated from resistive characteristics of mesa-structures at different thickness of interlayer showed an exponential decrease from 30 mV down to 5 mV with the increase of manganite interlayer thickness. Temperature dependence of the conductivity of mesa-structures could be described taking into account the d-wave superconductivity in YBCO and a spin filtering of the electron transport. Spin filtering is supported also by measurements of magneto-resistance and the high sensitivity of mesa-structure conductivity to weak magnetic fields.

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G. A. Ovsyannikov, K. Y. Constantinian, V. V. Demidov, Yu. V. Kislinskii, A. V. Shadrin, A. M. Petrzhik. 2017-01-19. Spin-filtering in superconducting junction with the manganite interlayer. https://arxiv.org/abs/1701.05364

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