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The problem of the nuclear spin-lattice relaxation in La$_2$CuO$_4$ isrevisited in connection with the recent measurements of the NQR relaxation ratefor temperatures up to $ 900\mbox{K} $ [T.\ Imai {\em et al.}, Phys.\ Rev.\Lett., in press]. We use an approach based on the exact diagonalization for theHeisenberg model to calculate the short wavelength contribution to therelaxation rate in the high temperature region, $ T \! \agt \! J/2 $. It isshown that the spin diffusion accounts for approximately 10\% of the totalrelaxation rate at $900 \mbox{K} $ and would become dominant for $T\! >\! J$.The calculated $1/T_1$ is in good agreement with the experiment both in termsof the absolute value and temperature dependence.Comment: 12 pages, RevTex (2 PostScript figures appended), UIUC-P-93-02-01

physical review. b, condensed matter

Theory of nuclear spin–lattice relaxation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>…

Theory of nuclear spin–lattice relaxation inLa2CuO4…