NMR evidence for localized spins on Cu(2) sites from Cu NMR in YBa/sub 2/Cu/sub 3/O/sub 7/ and YBa/sub 2/Cu/sub 3/O/sub 6. 75/ single crystals
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
We report /sup 63,65/Cu NMR spectra and nuclear spin-lattice relaxation data for YBa/sub 2/Cu/sub 3/O/sub 7/(T/sub c/ = 91 K) and YBa/sub 2/Cu/sub 3/O/sub 6.75/(T/sub c/ = 5/sub 7/ K) single crystals between 45 and 300 K. An analysis of the spin-lattice relaxation rates gives evidence for localized electronic spins on the planar Cu(2) sites. In YBa/sub 2/Cu/sub 3/O/sub 6.75/ both fourfold and twofold oxygen-coordinated Cu(1) are observed; the latter experience the same quadrupolar coupling (..nu../sub Q/approx. =31.5 MHz) as the Cu(2) sites but a nearly zero magnetic hyperfine shift and a much slower relaxation rate (d/sup 10/ configuration).
- Research Organization:
- Laboratoire de Spectrometrie Physique Universite Joseph, Fourier Grenoble I, Boi-italic-circumflexte Postale 87, 38402 Saint-Martin-d'Heres CEDEX, France
- OSTI ID:
- 6407534
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:10; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cu spin dynamics and superconducting precursor effects in planes above T/sub c/ in YBa/sub 2/Cu/sub 3/O/sub 6. 7/
Temperature-dependent anisotropy of Cu(2) nuclear-relaxation rate in YBa sub 2 Cu sub 3 O sub 7 below T sub c
Absence of metallic character at certain Cu sites in YBa/sub 2/Cu/sub 3/O/sub 6. 7/
Journal Article
·
Sun Mar 05 23:00:00 EST 1989
· Phys. Rev. Lett.; (United States)
·
OSTI ID:6359877
Temperature-dependent anisotropy of Cu(2) nuclear-relaxation rate in YBa sub 2 Cu sub 3 O sub 7 below T sub c
Journal Article
·
Tue Oct 01 00:00:00 EDT 1991
· Physical Review, B: Condensed Matter; (United States)
·
OSTI ID:5172247
Absence of metallic character at certain Cu sites in YBa/sub 2/Cu/sub 3/O/sub 6. 7/
Journal Article
·
Sat Dec 31 23:00:00 EST 1988
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:6552012
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER 63
COPPER 65
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
CRYSTALS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LOW TEMPERATURE
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER 63
COPPER 65
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
CRYSTALS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LOW TEMPERATURE
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES