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25 Apr 1988

Volume 52, Issue 17, pp. 1371-1448

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Study of oxygen transport in Ba2YCu3O7−δ using a solid‐state electrochemical cell

Eugene J. M. O’Sullivan and Bertha P. Chang

Appl. Phys. Lett. 52, 1441 (1988); http://dx.doi.org/10.1063/1.99691 (3 pages) | Cited 35 times

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A solid‐state electrochemical oxygen concentration cell with yttria‐stabilized zirconia (YSZ) as electrolyte was employed to study oxygen transport in Ba2YCu3O7−δ . On one side of the YSZ [a single‐crystal wafer oriented in the (100) plane], reference and counter electrodes were fabricated from sputtered Au. A ceramic pellet of Ba2YCu3O7−δ was pressed against the other side of the electrolyte. Using this cell, it was possible to electrochemically drive oxygen into and out of the Ba2YCu3O7−δ oxide electrode under controlled conditions. Current versus time and open circuit potential recovery data were analyzed according to various models. The diffusivity of oxygen in 94% dense Ba2YCu3O7−δ was estimated to ≂5×10−8 cm2 s−1 at 550 °C.
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66.30.Fq Self-diffusion in metals, semimetals, and alloys
74.78.-w Superconducting films and low-dimensional structures

High‐frequency characterization of thin‐film Y‐Ba‐Cu oxide superconducting transmission lines

Douglas R. Dykaar, Roman Sobolewski, James M. Chwalek, John F. Whitaker, Thomas Y. Hsiang, Gerard A. Mourou, Daniel K. Lathrop, Stephen E. Russek, and Robert A. Buhrman

Appl. Phys. Lett. 52, 1444 (1988); http://dx.doi.org/10.1063/1.99692 (3 pages) | Cited 24 times

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We report the first measurements of picosecond pulse propagation on transmission lines patterned from YBa2Cu3O7−x films. Distortion‐free propagation of high current density transients is demonstrated. The high‐frequency properties were analyzed by careful study of the relative phase delays of the electrical transients as the temperature of the sample was varied from 1.8 K to Tc. Simulations using Mattis–Bardeen complex conductivities showed good agreement with the measured results. High‐frequency critical current densities in excess of 105 A/cm2 were measured.
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84.71.Ba Superconducting magnets; magnetic levitation devices
84.40.Az Waveguides, transmission lines, striplines
74.70.-b Superconducting materials other than cuprates
74.78.-w Superconducting films and low-dimensional structures

Enhancement of transport critical current density by Gd substitution in YBa2Cu3O7

P. V. P. S. S. Sastry, I. K. Gopalakrishnan, J. V. Yakhmi, and R. M. Iyer

Appl. Phys. Lett. 52, 1447 (1988); http://dx.doi.org/10.1063/1.99693 (2 pages)

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Samples with composition Y1−xGdxBa2Cu3O7 (x=0.001–0.005) are prepared and TC, ΔTC, JC, ρ(300 K) are measured. It is shown that upon substituting yttrium by small amounts of gadolinium, JC can be improved significantly. The anticorrelation of JC with ΔTC and ρ(300 K) is established. The possible role of gadolinium in enhancing JC is discussed. General guidelines for getting high JC values are gathered.
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74.25.Sv Critical currents
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.70.-b Superconducting materials other than cuprates
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