Theory of Nuclear Spin-Lattice Relaxation in La$_2$CuO$_4$ at High Temperatures

Дата и время публикации : 1993-02-09T05:16:06Z

Авторы публикации и институты :
A. Sokol
E. Gagliano
S. Bacci

Ссылка на журнал-издание: Phys.Rev. B47 (1993) 14646
Коментарии к cтатье: 12 pages, RevTex (2 PostScript figures appended), UIUC-P-93-02-016
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: The problem of the nuclear spin-lattice relaxation in La$_2$CuO$_4$ is revisited in connection with the recent measurements of the NQR relaxation rate for temperatures up to $ 900mbox{K} $ [T. Imai {em et al.}, Phys. Rev. Lett., in press]. We use an approach based on the exact diagonalization for the Heisenberg model to calculate the short wavelength contribution to the relaxation rate in the high temperature region, $ T ! agt ! J/2 $. It is shown that the spin diffusion accounts for approximately 10% of the total relaxation 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 terms of the absolute value and temperature dependence.

Category: Physics