Abstract
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}.
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