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Title: Hyperfine interactions associated with iron substituted superconducting oxides

Abstract

Theoretical and experimental Moessbauer spectroscopy studies have been made concerning charge and spin densities and magnetic hyperfine fields (H{sub hf}) in iron-substituted superconducting oxides. Calculations were carried out in the self-consistent-field embedded cluster model using local density theory (SCF-X{alpha}) with a variational atomic orbital basis. Spectral densities and changes in charge and spin density were monitored around neighboring Cu sites, as well as Fe impurity site, and La{sub 2}Cu{sub 1-x}Fe{sub x}O{sub 4} and YBa{sub 2}Cu{sub 3-x}Fe{sub x}O{sub 7-y} compounds. Moessbauer isomer shifts (IS), quadrupole splittings (QS) and H{sub hf} are obtained by fitting multiline models to the observed spectra and are compared with SCF-X{alpha} results for specific lattice sites. The influence of oxygen vacancies and partial oxygen disorder is modelled and compared with the experimental data on variable oxygen content and disorder. 10 refs., 3 tabs.

Authors:
;  [1]; ; ;  [2];  [3]
  1. Argonne National Lab., IL (USA)
  2. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ (Brazil)
  3. Northern Illinois Univ., Dekalb, IL (USA)
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
Sponsoring Org.:
DOE/ER
OSTI Identifier:
6895170
Report Number(s):
CONF-8810423-1
ON: DE90010411; TRN: 90-012609
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: Latin American conference on the applications of the Moessbauer Effect, Rio de Janeiro (Brazil), 31 Oct - 4 Nov 1988
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; SUPERCONDUCTING COMPOSITES; HYPERFINE STRUCTURE; COPPER OXIDES; IRON COMPOUNDS; LANTHANUM COMPOUNDS; MOESSBAUER SPECTROMETERS; SPIN; YTTRIUM COMPOUNDS; ANGULAR MOMENTUM; CHALCOGENIDES; COMPOSITE MATERIALS; COPPER COMPOUNDS; GAMMA SPECTROMETERS; MATERIALS; MEASURING INSTRUMENTS; OXIDES; OXYGEN COMPOUNDS; PARTICLE PROPERTIES; RARE EARTH COMPOUNDS; SPECTROMETERS; TRANSITION ELEMENT COMPOUNDS; 656100* - Condensed Matter Physics- Superconductivity; 360104 - Metals & Alloys- Physical Properties

Citation Formats

Ellis, D E, Dunlap, B D, Saitovitch, E B, Azevedo, I S, Scorzelli, R B, and Kimball, C W. Hyperfine interactions associated with iron substituted superconducting oxides. United States: N. p., 1989. Web.
Ellis, D E, Dunlap, B D, Saitovitch, E B, Azevedo, I S, Scorzelli, R B, & Kimball, C W. Hyperfine interactions associated with iron substituted superconducting oxides. United States.
Ellis, D E, Dunlap, B D, Saitovitch, E B, Azevedo, I S, Scorzelli, R B, and Kimball, C W. Thu . "Hyperfine interactions associated with iron substituted superconducting oxides". United States. https://www.osti.gov/servlets/purl/6895170.
@article{osti_6895170,
title = {Hyperfine interactions associated with iron substituted superconducting oxides},
author = {Ellis, D E and Dunlap, B D and Saitovitch, E B and Azevedo, I S and Scorzelli, R B and Kimball, C W},
abstractNote = {Theoretical and experimental Moessbauer spectroscopy studies have been made concerning charge and spin densities and magnetic hyperfine fields (H{sub hf}) in iron-substituted superconducting oxides. Calculations were carried out in the self-consistent-field embedded cluster model using local density theory (SCF-X{alpha}) with a variational atomic orbital basis. Spectral densities and changes in charge and spin density were monitored around neighboring Cu sites, as well as Fe impurity site, and La{sub 2}Cu{sub 1-x}Fe{sub x}O{sub 4} and YBa{sub 2}Cu{sub 3-x}Fe{sub x}O{sub 7-y} compounds. Moessbauer isomer shifts (IS), quadrupole splittings (QS) and H{sub hf} are obtained by fitting multiline models to the observed spectra and are compared with SCF-X{alpha} results for specific lattice sites. The influence of oxygen vacancies and partial oxygen disorder is modelled and compared with the experimental data on variable oxygen content and disorder. 10 refs., 3 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/6895170}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {6}
}

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