Temperature dependence of the anisotropy of the planar oxygen nuclear spin-lattice relaxation rate in YBa{sub 2}Cu{sub 3}O{sub y}

Journal Article · Fri May 01 04:00:00 EDT 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.11769· OSTI ID:603126

Martindale, J A; Hammel, P C; Hults, W L; Smith, J L ^[1]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

We report measurements of the full planar {sup 17}O nuclear spin-lattice relaxation rate tensor in optimally and underdoped YBa{sub 2}Cu{sub 3}O{sub y} (y=6.96 and 6.63). The anisotropy varies strongly with temperature in both samples: for the y=6.63 sample, the ratio of the relaxation rate measured with the applied field in the ab plane and oriented parallel to the copper-oxygen bond axis to that measured with the applied field in the ab plane and oriented perpendicular to the bond axis changes by over 25{percent} from room temperature to T{sub c}. The consequences of these results for theoretical models are discussed. They suggest that a second spin degree of freedom independent of the Cu(3d{sub x{sup 2}{minus}y{sup 2}}){endash}O(2p{sigma}) band exists in the CuO{sub 2} planes of YBa{sub 2}Cu{sub 3}O{sub y}. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 603126
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BARIUM OXIDES
CHEMICAL BONDS
COPPER OXIDES
CRYSTAL DOPING
HIGH-TC SUPERCONDUCTORS
OXYGEN 17
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
TENSORS
YTTRIUM OXIDES