Cu and O NMR studies of the magnetic properties of YBa sub 2 Cu sub 3 O sub 6. 63 ( T sub c =62 K)
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (US)
The microscopic magnetic properties of the CuO{sub 2} planes in YBa{sub 2}Cu{sub 3}O{sub 6.63} ({ital T}{sub {ital c}}=62 K) have been investigated in Cu and O NMR experiments. Unlike the fully oxygenated Y-Ba-Cu-O{sub 7} ({ital T}{sub {ital c}}{congruent}90 K), the various components of the Cu and O Knight-shift tensors show strong but identical temperature dependences in the normal state. This supports the picture that there is only one spin component in the CuO{sub 2} planes. The spin susceptibility deduced from Knight-shift results shows significant reduction with decreasing temperature in the normal state. The temperature dependences of the nuclear-spin-relaxation rates (1/{ital T}{sub 1}) are very different for the Cu and the O sites. 1/({ital T}{sub 1}{ital T}) at the O sites is nearly proportional to the spin susceptibility. 1/({ital T}{sub 1}{ital T}) at the Cu sites shows a broad peak around 150 K. We discuss these relaxation behaviors based on a model of the dynamical spin susceptibility proposed by Millis, Monien, and Pines.
- OSTI ID:
- 6258845
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:1; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
KNIGHT SHIFT
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
RELAXATION
RELAXATION TIME
RESONANCE
SPIN-LATTICE RELAXATION
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
KNIGHT SHIFT
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
RELAXATION
RELAXATION TIME
RESONANCE
SPIN-LATTICE RELAXATION
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES