Date of Original Version
We have carried out an extensive simulation study for the spin autocorrelation function at T=∞ of the one‐dimensional classical Heisenberg model with four different types of isotropic bilinear nearest‐neighbor coupling: uniform exchange, alternating exchange, and two kinds of random exchange. For the long‐time tails of all but one case, the simulation data seem incompatible with the simple ∼t −1/2 leading term predicted by spin diffusion phenomenology.
Niraj Srivastava, Jian-Min Liu, V. S. Viswanath and Gerhard Müller. Spin diffusion in classical Heisenberg magnets with uniform, alternating, and random exchange. J. Appl. Phys. 75 (1994), 6751-6753.
Available at: http://dx.doi.org/10.1063/1.356842