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Title: 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

Abstract

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}

Authors:
;  [1]; ;  [2]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)
Publication Date:
OSTI Identifier:
698876
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 60; Journal Issue: 10; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; YTTRIUM COMPOUNDS; BARIUM COMPOUNDS; HIGH-TC SUPERCONDUCTORS; LATTICE PARAMETERS; SUPERCONDUCTIVITY; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; NEUTRON DIFFRACTION; CRYSTAL STRUCTURE; ISOTOPE EFFECTS; ANHARMONIC CRYSTALS; COPPER 65; COPPER 63; CHAINS

Citation Formats

Louca, D., Kwei, G.H., Dabrowski, B., and Bukowski, Z. 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. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.60.7558.
Louca, D., Kwei, G.H., Dabrowski, B., & Bukowski, Z. 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. United States. doi:10.1103/PhysRevB.60.7558.
Louca, D., Kwei, G.H., Dabrowski, B., and Bukowski, Z. Wed . "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". United States. doi:10.1103/PhysRevB.60.7558.
@article{osti_698876,
title = {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},
author = {Louca, D. and Kwei, G.H. and Dabrowski, B. and Bukowski, Z.},
abstractNote = {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}},
doi = {10.1103/PhysRevB.60.7558},
journal = {Physical Review, B: Condensed Matter},
number = 10,
volume = 60,
place = {United States},
year = {1999},
month = {9}
}