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Structural implications of nuclear electric quadrupole splittings in high-T/sub c/ superconductors

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
The electric field gradients and nuclear quadrupole coupling constants are calculated for La in La/sub 2/CuO/sub 4/, Eu in EuBa/sub 2/Cu/sub 3/O/sub 7/, and Cu and Fe (as a replacement for Cu in YBa/sub 2/Cu/sub 3/O/sub 7/. We use an ionic model which regards the high-T/sub c/ superconductors as primarily ionic crystals modified by the introduction of a relatively small number of charge carriers via doping in La/sub 2/CuO/sub 4/ and nonstoichiometry in YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ for delta<0.5. Good agreement between theory and experiment is obtained for the spherically symmetric free-ion species La/sup 3+/ and Eu/sup 3+/ with distortion of the partially filled Eu/sup 3+/ /sup 7/F/sub 0/ state by the ionic crystal field playing an important role. Comparison of theory and experiment for the Cu and Fe cases suggests Cu is present largely as Cu/sup 2+/ and supports the assignment of the low- and high-frequency nuclear quadrupole resonance lines to the chain and plane sites of YBa/sub 2/Cu/sub 3/O/sub 7/, respectively, while Fe is present as a mixture of Fe/sup 2+/ (ca. 25% to 50%) and Fe/sup 3+/.
Research Organization:
Milton S. Eisenhower Research Center, The Applied Physics Laboratory, The Johns Hopkins University, Laurel, Maryland 20707
OSTI ID:
6866178
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:4; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER 63
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
CRYSTAL FIELD
CRYSTAL MODELS
EUROPIUM 151
EUROPIUM COMPOUNDS
EUROPIUM ISOTOPES
EUROPIUM OXIDES
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
IRON 57
IRON ISOTOPES
ISOTOPES
LANTHANUM 139
LANTHANUM COMPOUNDS
LANTHANUM ISOTOPES
LANTHANUM OXIDES
MATHEMATICAL MODELS
NUCLEAR QUADRUPOLE RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RESONANCE
STABLE ISOTOPES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES