Spin dynamics and magnetic resonance in two-dimensional Heisenberg antiferromagnets

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.996· OSTI ID:6478308

Singh, R R.P. ^[1]; Gelfand, M P ^[2]

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1. Department of Physics, University of California, Davis, California 95616 (USA)
2. Department of Physics, University of California, Los Angeles, CA (USA)

High-temperature expansions are calculated and extrapolated to yield estimates of low-order time derivatives of one- and two-point dynamic correlations in the {ital S}=1/2 Heisenberg antiferromagnet. Taking this model to describe the spin correlations in Y-Ba-Cu-O, spin-lattice relaxation rates ({ital T}{sub 1}{sup {minus}1}) for Y and planar Cu and O nuclei are estimated by means of Moriya's Gaussian approximation. For Y and O, ({ital T}{sub 1}{ital T}){sup {minus}1} exhibits a broad plateau in the range 0.7{lt}{ital T}/{ital J}{lt}1.5, and in that interval their Korringa ratios are also nearly constant, being 0.25 and 1.1 times the free-electron value, respectively.

• OSTI ID: 6478308
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:1; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM
ANTIFERROMAGNETIC MATERIALS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATION FUNCTIONS
CRYSTAL MODELS
FUNCTIONS
HEISENBERG MODEL
HIGH-TC SUPERCONDUCTORS
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
RELAXATION
SPIN
SPIN-LATTICE RELAXATION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS