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Observation of an oxygen isotope effect in superconducting (Y sub 1 minus x Pr sub x )Ba sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · · Physical Review, B: Condensed Matter; (United States)
; ;  [1];  [2];  [3]
  1. Department of Physics, University of Alberta, Edmonton, Alberta (Canada)
  2. Department of Physics, Simon Fraser University, Burnaby, British Columbia (Canada)
  3. Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario (Canada)
The oxygen isotope effect was studied in the system (Y{sub 1{minus}{ital x}}Pr{sub {ital x}})Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} for {ital x}=0.2, 0.3, 0.4, and 0.5. It is found that the oxygen isotope exponent {alpha} increases with increasing {ital x} and therefore decreasing transition temperature {ital T}{sub {ital c}}. For the highest Pr concentrations {alpha} tends toward {alpha}=0.5. The value of the isotope exponent depends on the concentration of mobile holes. The lower this concentration is, the larger becomes the isotope exponent.
OSTI ID:
5206134
Journal Information:
Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:10; ISSN 0163-1829; ISSN PRBMD
Country of Publication:
United States
Language:
English