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Oxygen isotope effect in YBa/sub 2/Cu/sub 3/O/sub 7/ prepared by burning YBa/sub 2/Cu/sub 3/ in /sup 16/O and /sup 18/O

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
We prepared YBa/sub 2/Cu/sub 3/ powder by ball milling a 2:1 molar mixture of the intermetallics BaCu and CuY. We synthesized YBa/sub 2/Cu/sub 3/(/sup 16/O)/sub 7-//sub x/ and YBa/sub 2/Cu/sub 3/(/sup 18/O)/sub 7-//sub x/ by oxidizing the YBa/sub 2/Cu/sub 3/ powder in /sup 16/O and /sup 18/O. The /sup 16/O//sup 18/O ratios were determined by laser-ionization and sputtering-ionization mass spectroscopy. The YBa/sub 2/Cu/sub 3/(/sup 16/0)/sub 7-//sub x/ sample had 99.8 at. %/sup 16/O, and the YBa/sub 2/Cu/sub 3/(/sup 18/O)/sub 7-//sub x/ sample had 96.5 at. %/sup 18/O. Susceptibility measurements of the superconducting transition temperature (T/sub c/) = 91.7 K for /sup 16/O; half-point transition at 84 K show an isotope effect of 0.4 +- 0.1 K.
Research Organization:
Center for Materials Science and P-10, Los Alamos National Laboratory, Mail Stop K-765, Los Alamos, New Mexico 87545
OSTI ID:
6151385
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:10; ISSN PRBMD
Country of Publication:
United States
Language:
English