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Proceedings Paper

Angular dependence of tunneling effects in Ba1-xKxBiO3 grain boundaries
Author(s): Andreas Kussmaul; Eric S. Hellman; Elliot H. Hartford; Arunava Gupta; Prabha K. Tedrow
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Paper Abstract

We report on the tunneling properties of Ba1-xKxBiO3 (BKBO) grain boundaries prepared on bicrystal substrates. We studied symmetric tilt boundaries with 5 degree(s), 24 degree(s), 36.8 degree(s) and 45 degree(s) misorientation on SrTiO3, and 24 degree(s) on MgO substrates. The three high angle misorientations used yield clear superconductor- insulator-superconductor behavior, with very little conductance below the bias corresponding to twice the BKBO energy gap, and a strong peak at that value. The two samples prepared on MgO yielded somewhat broader tunneling characteristics, but otherwise similar features compared to the samples prepared on SrTiO3; they showed the lowest junction resistivity and the weakest conductance increase at high bias. The linear conductance background consistently observed in superconductor-insulator, normal metal junctions is absent in the grain boundary junctions. For the 5 degree(s) samples, we observe weak link behavior below Tc, with a critical current density of 65 A/cm2. A similar angular dependence is seen in Nd1.85Ce0.15CuO4-(delta ).

Paper Details

Date Published: 10 August 1994
PDF: 11 pages
Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); doi: 10.1117/12.182679
Show Author Affiliations
Andreas Kussmaul, AT&T Bell Labs. (United States)
Eric S. Hellman, AT&T Bell Labs. (United States)
Elliot H. Hartford, AT&T Bell Labs. (United States)
Arunava Gupta, IBM Thomas J. Watson Research Ctr. (United States)
Prabha K. Tedrow, Francis Bitter National Magnet Lab. (United States)

Published in SPIE Proceedings Vol. 2158:
Oxide Superconductor Physics and Nano-Engineering
Davor Pavuna; Ivan Bozovic, Editor(s)

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