Volume 115, Number 6, September 2016
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 November 2016|
Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder
Institute for Solid State Physics, University of Tokyo - 5-1-5 Kashiwanoha, Chiba 277-8581, Japan
Received: 30 August 2016
Accepted: 12 October 2016
Ferromagnetic insulator Josephson junctions consisting of Nb/Au/Pr0.8Ca0.2MnO3/La1.85Sr0.15CuO4 layers were fabricated. Non-linear current-voltage characteristics suggest the presence of superconducting coupling between the Nb/Au and La1.85Sr0.15CuO4 layers across a ferromagnetic Pr0.8Ca0.2MnO3 tunnel barrier. Tunneling spectra showed clear conductance peaks due to quasi-particle tunneling. Superconducting gap energies determined from the tunneling spectra were consistent with the temperature dependence of the critical current of the junctions. We argue that magnetic inhomogeneity in the ultrathin tunnel barrier plays a role in linking the superconducting states in Nb/Au and La1.85Sr0.15CuO4.
PACS: 75.47.Lx – Magnetic oxides / 75.70.-i – Magnetic properties of thin films, surfaces, and interfaces / 74.50.+r – Tunneling phenomena; Josephson effects
© EPLA, 2016
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