Magnetic field effect on sup 63 Cu nuclear relaxation rates in YBa sub 2 Cu sub 3 O sub 7 and in La sub 1. 85 Sr sub 0. 15 CuO sub 4 above and below T sub c

Journal Article · Mon Feb 03 00:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.698· OSTI ID:5000826

Borsa, F ^[1]; Rigamonti, A; Corti, M ^[2]; Ziolo, J; Hyun, O; Torgeson, D R ^[3]

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1. Ames Laboratory U.S. DOE, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States) Department of Physics, University of Pavia, Pavia (Italy)
2. Department of Physics, A. Volta,'' University of Pavia, Pavia (Italy)
3. Ames Laboratory U.S. DOE, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

Nuclear electric quadrupole measurements of {sup 63}Cu nuclear spin-lattice relaxation rates ({ital R}{sub 1}) in zero applied magnetic field and nuclear magnetic resonance {ital R}{sub 1} in 8.2 T are reported for YBa{sub 2}Cu{sub 3}O{sub 7} and La{sub 1.85}Sr{sub 0.15}CuO{sub 4}. A direct effect of the magnetic field is seen for the first time both above and below {ital T}{sub {ital c}}. Above {ital T}{sub {ital c}} the effect is ascribed to the partial suppression of antiferromagnetic (AF) spin fluctuations. For {ital T}{lt}{ital T}{sub {ital c}} the effect goes in the opposite sense and may be related to the spin-temperature diffusion for the core of the fluxons or to the enhancement of AF spin fluctuations persisting in the superconducting phase.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5000826
• Journal Information: Physical Review Letters; (United States), Vol. 68:5; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
NUCLEAR MAGNETIC RESONANCE
NUCLEAR QUADRUPOLE RESONANCE
CUPRATES
LANTHANUM OXIDES
YTTRIUM OXIDES
ANTIFERROMAGNETISM
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
LANTHANUM COMPOUNDS
MAGNETIC RESONANCE
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RELAXATION
RESONANCE
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)