Angular dependence of tunneling effects in Ba1-xKxBiO3 grain boundaries

Andreas Kussmaul; Eric S. Hellman; Elliot H. Hartford Jr.; Arunava Gupta; Prabha K. Tedrow

doi:10.1117/12.182679

10 August 1994 Angular dependence of tunneling effects in Ba_1-xK_xBiO₃ grain boundaries

Andreas Kussmaul, Eric S. Hellman, Elliot H. Hartford Jr., Arunava Gupta, Prabha K. Tedrow

Proceedings Volume 2158, Oxide Superconductor Physics and Nano-Engineering; (1994) https://doi.org/10.1117/12.182679
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We report on the tunneling properties of Ba_1-xK_xBiO₃ (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 T_c, with a critical current density of 65 A/cm². A similar angular dependence is seen in Nd_1.85Ce_0.15CuO_4-(delta ).

Citation Download Citation

Andreas Kussmaul, Eric S. Hellman, Elliot H. Hartford Jr., Arunava Gupta, and Prabha K. Tedrow "Angular dependence of tunneling effects in Ba_1-xK_xBiO₃ grain boundaries", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); https://doi.org/10.1117/12.182679

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