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Science 30 October 1992:
Vol. 258. no. 5083, pp. 781 - 783
DOI: 10.1126/science.258.5083.781
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Articles

Large Enhancement in Oxygen Mobility in the Superconductors RBa2Cu3O7 with Increasing Rare-Earth Size

J. L. Tallon 1 and B. -E. Mellander 1

1 New Zealand Institute for Industrial Research and Development, Post Office Box 31310, Lower Hutt, New Zealand

Ultrasonic composite oscillator measurements of the mechanical relaxation in RBa2Cu3O7–8 arising from oxygen hopping in the basal chain layer show enhancements in oxygen mobility of 20, 50, and 100 times for R = gadolinium, neodymium, and lanthanum, respectively, above that for R = yttrium. The use of the larger rare earths offers a practical solution to the major problem of slow oxygen diffusion in single crystals and bulk, dense material for wires and melt-textured monolithic bodies.

Submitted on May 29, 1992
Accepted on August 25, 1992

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Science. ISSN 0036-8075 (print), 1095-9203 (online)