Comparison of nuclear spin relaxation rates at Y and O sites in YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital y]]
- IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (United States) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We report a detailed comparison of the [sup 89]Y and the planar [sup 17]O NMR shifts [ital K] and spin-lattice relaxation rates 1/[ital T][sub 1] in oriented YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital y]] powder with [ital y][congruent]0 and [ital y]=0.37. For [ital y]=0.37, the ratio [ital R] of the O relaxation rate to the Y relaxation rate increases with decreasing temperature above [ital T][sub [ital c]] and [ital T][sub 1][ital TK] at Y sites is not constant, which suggests that the antiferromagnetic spin correlations between adjacent CuO[sub 2] layers grow with decreasing temperature. The magnitude of [ital R] in both [ital y]=0.37 and [ital y][congruent]0 is smaller than evaluated from an ionic model of the hyperfine Hamiltonian.
- OSTI ID:
- 5937995
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:16; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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360204 -- Ceramics
Cermets
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360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
COPPER COMPOUNDS
COPPER OXIDES
EVALUATION
EVEN-ODD NUCLEI
HIGH-TC SUPERCONDUCTORS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KNIGHT SHIFT
LIGHT NUCLEI
MAGNETIC RESONANCE
MAGNETISM
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN 17
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
RADIOISOTOPES
RELAXATION
RESONANCE
SECONDS LIVING RADIOISOTOPES
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM 89
YTTRIUM COMPOUNDS
YTTRIUM ISOTOPES
YTTRIUM OXIDES