Investigation of Nd-Ce-Cu-O planar tunnel junctions and bicrystal grain boundary junctions

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. Tunn...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.3917-3920
Main Authors: Woods, S.I., Katz, A.S., Kirk, T.L., de Andrade, M.C., Maple, M.B., Dynes, R.C.
Format: Article
Language:English
Subjects:
Applied sciences
BICRYSTALS
BOUNDARIES
ELECTRICAL CONDUCTIVITY
Electronics
Exact sciences and technology
GRAIN BOUNDARIES
Hysteresis
Josephson junctions
Lead (metal)
MAGNETIC FIELD
Magnetic fields
Magnetic films
Magnetic modulators
MECHANICAL HYSTERESIS
Phonons
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Spectroscopy
Superconducting devices
Superconducting films
SUPERCONDUCTIVITY
Tunnel junctions
Tunneling
Yttrium
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Summary: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 junctions were made by laser ablating thin NCCO films onto yttrium-stabilized-zirconia bicrystal substrates and sustain supercurrents that modulate in applied magnetic field and show resistively-shunted-junction I-V characteristics.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.783884