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Showing papers on "Scanning tunneling spectroscopy published in 1968"


Journal ArticleDOI
TL;DR: In this paper, the authors used tunneling to study the superconductivity of small Sn particles imbedded in an oxide film and found that no lower size limit for superconductivities has been found down to a particle radius.
Abstract: We have used tunneling to study the superconductivity of small Sn particles imbedded in an oxide film. In contradiction to existing theories, no lower size limit for superconductivity has been found down to a particle radius $\mathcal{r}=25$ \AA{}. The junction characteristic shows a large peak in resistance at zero bias even for normal particles. This resistance maximum can be explained in terms of a capacitor model of the particle.

237 citations


Journal ArticleDOI
TL;DR: Using the technique of electron tunneling between two Al films, the authors have found phonon structure in granular Al. This spectrum is also observed with the aluminum in the normal state, and is therefore attributed to phonon assisted tunneling.

41 citations


Journal ArticleDOI
Peter Schnupp1
TL;DR: In this article, a numerical integration of Schrodinger's equation for a tunneling wave packet leads to tunneling time between 10 -14 and 10 -15 sec for typical parameters of film and electrodes.

30 citations


Journal ArticleDOI
TL;DR: In this paper, a conductance well was observed, which is related to the band edges of the amorphous germanium film and its surface potential, and was interpreted as tunneling into gap states.
Abstract: Electron tunneling into amorphous germanium films was studied using Al–Al2O3–Ge tunnel junctions A ``conductance well'' was observed, which is related to the band edges of the amorphous germanium film and its surface potential Structure in the conductance well is interpreted as tunneling into gap states The results suggest tunneling as a possible tool for the study of band structure in amorphous materials

27 citations


Journal ArticleDOI
TL;DR: In this article, the electron and phonon tunneling spectroscopy in metal contacts was used for the first time, with improved agreement with one electron model compared to the other electron model.
Abstract: Electron and phonon tunneling spectroscopy in metal Ge contacts, noting improved agreement with one electron model

22 citations



Journal ArticleDOI
01 Aug 1968
TL;DR: In this paper, the authors generalized the method developed by one of the authors to include paramagnetic impurities in order to explain zero bias tunneling anomalies, and investigated the change of the local density of states depending on the positions of the impurities relative to the metal-oxide interface.
Abstract: The method developed by one of the authors is generalized to include paramagnetic impurities in order to explain zero bias tunneling anomalies. The self-energy of the electrons is supposed to be a local function in space; nonlocal or assisted tunneling effects are beyond the scope of the present theory. The tunneling current is expressed in terms of the local density of states at the barrier which in turn is given in terms of the life-time of the conduction electrons. The change of the local density of states depends on the positions of the impurities relative to the metal-oxide interface. This dependence is thoroughly investigated.

11 citations


Journal ArticleDOI
TL;DR: In this paper, structure has been detected in tunneling data for high purity single crystal Nb which suggests a compliance excitation spectrum in the Nb Nb tunneling signal.

10 citations