Statics and kinetics of oxygen ordering in the oxide superconductor YBa{sub 2}Cu{sub 3}O{sub z}

Conference · Sun Mar 01 04:00:00 EST 1992

OSTI ID:10164204

McCormack, R; de Fontaine, D ^[1]; Ceder, G ^[2]; Salomons, E ^[3]

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1. Lawrence Berkeley Lab., CA (United States)
2. Massachusetts Inst. of Tech., Cambridge, MA (United States)
3. CEN Saclay, Gif-sur-Yvette, (France)

Oxygen ordering in the high-temperature superconductor YBa{sub 2}Cu{sub 3}O{sub z} is well described by a two-dimensional Ising model with anisotropic next-nearest neighbor effective pair interactions, repulsive along the a direction, attractive along b. Monte Carlo simulation shows that this marked anisotropy gives rise, particularly at stoichiometric index z close to 7, to large deviations from unity of the ratio D{sub 11}{sup *}/D{sub 22}{sup *} of tracer diffusion tensor components in the a and b directions. Oxygen ordering kinetics are shown to evolve in a manner which parallels those of the experimentally observed increase with aging time of the superconducting transition temperature of z<7.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10164204
• Report Number(s): LBL--32164; CONF-920305--12; ON: DE92017001
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202
BARIUM OXIDES
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFUSION
HIGH-TC SUPERCONDUCTORS
ISING MODEL
OXYGEN
PHASE DIAGRAMS
STRUCTURE AND PHASE STUDIES
YTTRIUM OXIDES