Abstract
We report measurements of the temperature dependent resistivity (T ) of a gold film 70 nm thick deposited on mica preheated to 300 °C in UHV, performed between 4 K and 300 K, and measurements of the surface topography of the same film performed with a scanning tunnelling microscope (STM). From the roughness measured with the STM we determine the parameters (r.m.s. amplitude) and (lateral correlation length) corresponding to a Gaussian and to an exponential representation of the average autocorrelation function (ACF). We use the parameters and determined via STM measurements to calculate the quantum reflectivity R, and the temperature dependence of both the bulk resistivity 0(T ) and of the increase in resistivity (T ) = (T ) - 0(T ) induced by electron-surface scattering on this film, according to a modified version of the theory of Sheng, Xing and Wang recently proposed (Munoz et al 1999 J. Phys.: Condens. Matter 11 L299). The resistivity 0 in the absence of surface scattering predicted for a Gaussian representation of the ACF is systematically smaller than that predicted for an exponential representation of the ACF at all temperatures. The increase in resistivity induced by electron-surface scattering predicted for a Gaussian representation of the average ACF data is about 25% larger than the increase in resistivity predicted for an exponential representation of the ACF data.
Published Version
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