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Investigation of Nd-Ce-Cu-O planar tunnel junctions and bicrystal grain boundary junctions
1999
IEEE transactions on applied superconductivity
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We have fabricated planar c-axis Pb/NCCO junctions and in-plane NCCO bicrystal grain boundary junctions. The Pb/NCCO junctions exhibit single-step elastic tunneling and sustain hysteretic Josephson supercurrents, evidence that NCCO has an s-wave component to its superconducting order parameter. Tunneling spectroscopy on high-resistance Pb/NCCO junctions reveals a semi-gap of 3-4 meV in the density of states of NCCO and evidence for phonon coupling to NCCO quasiparticles. The grain boundary
doi:10.1109/77.783884
fatcat:ph77ryawarhzbobrhqynxz333u