By utilizing a mechanically controllable break junction, point contact spectra dV/dI were determined for various noble metals (Cu; Au) doped with magnetic impurities (Mn). The contact diameter d could be varied continuously between ca. 2 and 50 nm. The zero bias maximum in dV/dI due to the Kondo scattering exhibits a large broadening and increase of relative amplitude as d is decreased. By using the theoretical expression for the logarithmic slope of dV/dI vs V we find a significant enhancement of exchange coupling parameter J, which leads to an enormous increase in the apparent Kondo temperature TK for small contact diameters.
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Yanson et al. (1995) studied this question.
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