Abstract
The theory of AC magnetoresistance in inhomogeneous solids is developed using the effective-medium theory. Calculations are performed for systems which consist of random high- and low-conductivity regions. The weak magnetic field H is directed along the z axis. The effective conductivity changes Delta sigma mxx and Delta sigma mzz and the magnetoresistance Delta rho mxx and Delta rho mzz in both the low- and the high-frequency regions are calculated up to the H2 approximation. The calculations show that, owing to inhomogeneities, plateaux of the finite values Delta sigma mzz and Delta rho mzz in the low-frequency region occur. It is possible to have both Delta rho mxx> Delta rho mzz and Delta rho mxx< Delta rho mzz. In the high-frequency limit the equalities Delta sigma mzz= Delta rho mzz=0 hold as in homogeneous solids.
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