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The tunnel resistance of highly stable mechanically controlled break junctions of Al, Pt, Ag, and Au, recorded as a function of the electrode spacing, is found to be strongly influenced by the presence of adsorbed He atoms at low temperatures. Telegraph-noise-like resistance fluctuations of the tunnel resistance occur in a certain range of electrode separations when the measurements are performed in He gas at T0ex0ex=0ex0ex1.2 K. Some models which may be capable of explaining the observed effects are discussed.
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Keijsers et al. (1996) studied this question.
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