Pressure-dependent oxygen ordering in strongly underdoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}y}
- Department of Physics, Washington University, C. B. 1105, One Brookings Drive, St. Louis, Missouri 63130 (United States)
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
Previous studies on the high-T{sub c} superconductor Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} have given evidence for distinct low- and high-temperature oxygen ordering processes activated for temperatures above 13 and 200 K, respectively. In contrast, the present experiments on strongly underdoped YBa{sub 2}Cu{sub 3}O{sub 6.41} with T{sub c}(0){approx_equal}13K reveal only high-temperature relaxation processes with a relaxation time {tau} at 298 K which increases under pressure from approximately 10 h at 1 bar to 50 h at 0.79 GPa to 550 h at 2.3 GPa. From these results the activation volume is estimated to be 4.2cm{sup 3}/mol, a value equal to three-quarters of the molar volume of the O{sup 2{minus}} ion. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 550528
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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