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VOLUME 42 (1985) | ISSUE 9 | PAGE 363
Variation of the random potential and the conductivity of samples of small dimensions
The residual conductivity of samples of small dimensions is highly sensitive to small changes in the impurity potential. The conductivity of a film of finite thickness changes, for example, when an impurity is moved a finite distance, regardless of the film dimensions. This effect can be used to study extremely slow diffusion of impurities. The magnetoresistance of a spin glass, produced as a result of changing the way in which the exchange potential is produced in a magnetic field, is considered. A possible link between this effect and the experiments carried out by Webb et a/.5 [Phys. Rev. В 30, 4048 (1984); Phys. Rev. Lett. 51, 2696 (1985)] is discussed.