/sup 17/O NMR spectroscopy of magnetically ordered YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ microcrystals

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.781· OSTI ID:6757299

Coretsopoulos, C; Lee, H C; Ramli, E; Reven, L; Rauchfuss, T B; Oldfield, E

We have obtained /sup 17/O NMR spectra of powder samples of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ and EuBa/sub 2/Cu/sub 3/O/sub 7-//sub x/, as well as magnetically ordered YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/. Two major features are observed in YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/: a sharp resonance at approx. =1800 ppm (from external H/sub 2//sup 17/O, International Union of Pure and Applied Chemistry delta scale) and a broader series of features centered at approx. =400 ppm. The 1800-ppm feature undergoes a diamagnetic shift of approx. =800 ppm on cooling to 77 K, and a similar magnitude shift on Eu substitution, suggesting assignment to the plane oxygens, O(2,3). Measurements on magnetically ordered samples at 8.45 and 11.7 T give the magnitude of the diagonal terms of the electric field gradient tensor, which are 2.3, 3.5, and 5.8 MHz. For the columnar oxygen, O(1), we find e/sup 2/qQ/h = 7.7 MHz, with a chemical shift anisotropy of approx. =660 ppm.

• Research Organization: Department of Chemistry, University of Illinois, 505 South Mathews Avenue, Urbana, Illinois 61801
• OSTI ID: 6757299
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
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COPPER OXIDES
CRYSTALS
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EVEN-ODD NUCLEI
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MAGNETIC RESONANCE
MINERALS
MONOCRYSTALS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN 17
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PEROVSKITE
PEROVSKITES
RARE EARTH COMPOUNDS
RESONANCE
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STABLE ISOTOPES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES