Lattice effects observed by the isotope-difference pair density function of the YBa[sub 2][number sign]^{63/65Cu[sub 3]O[sub 6. 92] superconductor}

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.7558· OSTI ID:6104728

Louca, D; Kwei, G H ^[1]; Dabrowski, B; Bukowski, Z ^[2]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)

The local lattice effects in the YBa[sub 2]Cu[sub 3]O[sub 6.92] superconductor were characterized by the neutron differential pair density function (DPDF) analysis. The DPDF provides an atom specific PDF, enabling the distinction between overlapping atom pair correlations in complicated systems. It utilizes the contrast in the scattering amplitude enhanced by the different neutron scattering lengths for [sup 63]Cu and [sup 65]Cu in two isotopically pure samples with identical compositions. Significant structural distortions are observed in the superconducting planes, in association with the plane copper (Cu2). A bifurcation of the Cu2 to apical oxygen (O4) pair correlations is evident which is temperature dependent. This effect originates from distortions along the [ital c] axis of the crystal of the Cu2 ions and not of the O4, as no distortions are observed in association with the connecting pair, the Cu1 (chain)-O4. Secondary lattice anharmonicities in the chains are also seen, arising mostly from defects in the vicinity of oxygen vacancies. [copyright] [ital 1999] [ital The American Physical Society]

• OSTI ID: 6104728
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Vol. 60:10; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANHARMONIC CRYSTALS
BARIUM COMPOUNDS
BARIUM OXIDES
CHAINS
CHALCOGENIDES
COHERENT SCATTERING
COPPER 63
COPPER 65
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH-TC SUPERCONDUCTORS
INTERMEDIATE MASS NUCLEI
ISOTOPE EFFECTS
ISOTOPES
LATTICE PARAMETERS
NEUTRON DIFFRACTION
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STABLE ISOTOPES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES