Pressure-dependent oxygen ordering in strongly underdoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}y}

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.14168· OSTI ID:550528

Sadewasser, S; Wang, Y; Schilling, J S ^[1]; Zheng, H; Paulikas, A P; Veal, B W ^[2]

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1. Department of Physics, Washington University, C. B. 1105, One Brookings Drive, St. Louis, Missouri 63130 (United States)
2. 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

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
BARIUM OXIDES
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
RELAXATION
TEMPERATURE RANGE 0273-0400 K
TRANSITION TEMPERATURE
YTTRIUM OXIDES