Abstract
The theory of the strain coefficient of resistance of discontinuous thin metal films is developed one stage beyond present levels by the inclusion of the variation of the activation energy. A variety of assumed island geometries is used in the development of simplified formulae. For all films tested, the activation energy decreases with strain giving a gauge factor which changes from positive at low resistance or high temperature to negative at high resistance or low temperature. This effect is predicted theoretically for flat disc-like islands where the strain is transmitted to the islands through points of adhesion with the substrate. In all cases the magnitudes of change observed are consistent with strains of approximately one order greater than those applied.
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