Electron and nuclear magnetic relaxation in La sub 2 CuO sub 4 and related cuprates

Journal Article · Mon Jan 08 00:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.224· OSTI ID:7007895

Chakravarty, S; Orbach, R ^[1]

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1. Department of Physics, University of California, Los Angeles, Los Angeles, California 90024-1547 (US)

The nuclear-magnetic-resonance spin-lattice relaxation time ({ital T}{sub 1}) and electron-paramagnetic-resonance (EPR) linewidth ({Gamma}{sub {perpendicular}}{sup {ital s}}) are calculated for La{sub 2}CuO{sub 4}. The large broadening of the EPR at room temperature is shown to narrow with increasing temperature as ({xi}/{ital a}){sup 3}, where {xi} is the two-dimensional spin-correlation length and {ital a} is the lattice constant. The NMR {ital T}{sub 1} at first lengthens with increasing temperature as ({xi}/{ital a}){sup {minus}1}, then shortens above {ital T}{similar to}{ital J}/2, where {ital J} is the in-plane exchange coupling. Explicit values are calculated for {ital T}{sub 1} and {Gamma}{sub {perpendicular}}{sup 2}.

• OSTI ID: 7007895
• Journal Information: Physical Review Letters; (USA), Vol. 64:2; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
MAGNETIC RESONANCE
COPPER OXIDES
LANTHANUM OXIDES
YTTRIUM OXIDES
ELECTRON SPIN RESONANCE
EXCHANGE INTERACTIONS
HIGH TEMPERATURE
LATTICE PARAMETERS
LINE BROADENING
LINE NARROWING
LINE WIDTHS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NUCLEAR MAGNETIC RESONANCE
TWO-DIMENSIONAL CALCULATIONS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
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INTERACTIONS
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OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RESONANCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties