Low Temperature Physics: 33, 122 (2007); https://doi.org/10.1063/1.2409647 (6 pages)
Fizika Nizkikh Temperatur: Volume 33, Number 2-3 (February 2007), p. 174-181 ( to contents , go back )
Weak localization in multilayer structures and superlattices
Institute of Metal Physics , S. Kovalevskoyi st. 18, Ekaterinburg 620219, Russia
Received September 27, 2006
The weak localization phenomenon in a quasitwo-dimensional disordered system in orthogonal magnetic field is investigated. It is assumed that the coherent electron tunelling between the layers is so weak that there occure no superlattice minibands, and the main contribution to the probabilities of interlayer transition of electrons is made by their scattering in a random impurity field. In the case of insulating boundary conditions, analytical expressions for interference corrections to longitudinal resistivity of the system with an arbitrary finite number of layers are obtained. It is shown that the interlayer electron scattering has a negligible influence on the diffusion magnetotransport, but it markedly diminishes the weak localization effect as an additional mechanism of the phase relaxation. The influence of boundary conditions on the effect of weak localization in the multilayers structure depending on the number of layers is analysed. The obtained results describe well the negative magnetoresistance in the natural superlattices of Nd1-xCexCuO4 above the critical temperature.
PACS: 72.15.Rn Localization effects (Andersonor weak localization)
Key words: cooperon in multilayer structure, negative magnetoresistance, interlayer scattering.