Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder

T. Harada, M. Matvejeff, R. Takahashi, M. Lippmaa

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number67005
JournalEPL
Volume115
Issue number6
DOIs
Publication statusPublished - 2016 Sep
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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