Hyperfine interactions associated with iron substituted superconducting oxides

Conference · Thu Jun 01 00:00:00 EDT 1989

OSTI ID:6895170

Ellis, D E; Dunlap, B D ^[1]; Saitovitch, E B; Azevedo, I S; Scorzelli, R B ^[2]; Kimball, C W ^[3]

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1. Argonne National Lab., IL (USA)
2. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ (Brazil)
3. Northern Illinois Univ., Dekalb, IL (USA)

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.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6895170
• Report Number(s): CONF-8810423-1; ON: DE90010411; TRN: 90-012609
• 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

Related Subjects

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