We consider diffusion of marked particles in random mixtures close to the percolation threshold, and investigate the effect of nearest-neighbor and Coulomb interaction between the mobile particles. At intermediate time scales t1≪t≪t2 then mean square displacement is described by a new exponent k', {reversed tilde equals}tk', which can be considerably smaller than the asymptotic value k for diffusion at the threshold. When the temperature is decreased, k' is decreased and t2 is increased. We expect that the frequency dependent conductivity σ (ω) scales at intermediate frequencies as σ (ω) {reversed tilde equals} ω1-k. © 1990.
Bunde, A., Maass, P., Roman, H., Dieterich, W., Petersen, J. (1990). Transport of disordered structures: Effect of long range interactions. SOLID STATE IONICS, 40-41(1), 187-191 [10.1016/0167-2738(90)90318-L].
Transport of disordered structures: Effect of long range interactions
Roman H. E.;
1990
Abstract
We consider diffusion of marked particles in random mixtures close to the percolation threshold, and investigate the effect of nearest-neighbor and Coulomb interaction between the mobile particles. At intermediate time scales t1≪t≪t2 then mean square displacement is described by a new exponent k', {reversed tilde equals}tk', which can be considerably smaller than the asymptotic value k for diffusion at the threshold. When the temperature is decreased, k' is decreased and t2 is increased. We expect that the frequency dependent conductivity σ (ω) scales at intermediate frequencies as σ (ω) {reversed tilde equals} ω1-k. © 1990.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
