/sup 17/O NMR spectroscopy of magnetically ordered YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ microcrystals
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
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
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
SPECTRA
STABLE ISOTOPES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES