Showing papers on "Scanning tunneling spectroscopy published in 1971"
TL;DR: In this paper, the spin-dependent tunneling density of superconducting aluminum and ferromagnetic nickel is determined by a polarization of the magnetic moments of the Ni current carriers parallel to the applied field.
Abstract: Tunneling measurements on junctions between very thin superconducting aluminum films and ferromagnetic nickel films in a high magnetic field show that the tunneling current is spin dependent. The effective tunneling density of states in Ni determined by this means implies a polarization of the magnetic moments of the Ni current carriers parallel to the applied field. The technique offers a new method for investigating spin-dependent states in magnetic materials.
399 citations
52 citations
TL;DR: In this article, the authors calculate the tunneling density of quasiparticle states in thin superconducting films in the presence of spin-orbit interactions and demonstrate that tunneling conductance between two identical material in a parallel field should be an especially sensitive function of spinorbit scattering.
Abstract: The observation of the magnetic field splitting of the quasiparticle states in thin superconducting films does make it possible to determine the size of spin-orbit interactions via tunneling experiments. We calculate the tunneling density of states of such films in the presence of spin-orbit interactions and demonstrate that the tunneling conductance between two films of identical material in a parallel field should be an especially sensitive function of spin-orbit scattering. Numerical results for the tunneling density of states as well as for the tunneling conductance as function of spin-orbit scattering rate are presented.
12 citations
TL;DR: A 15.7% anisotropy in the superconducting energy gap has been measured by electron tunneling into single crystals of rhenium, using thin carbon films as the tunneling barrier to form Re-C-In sandwiches as discussed by the authors.
Abstract: A 15.7% anisotropy in the superconducting energy gap has been measured by electron tunneling into single crystals of rhenium, using thin carbon films as the tunneling barrier to form Re-C-In sandwiches. The energy-gap behavior vs temperature is BCS-like. The anisotropy agrees with ultrasonic measurements of other hcp metals and suggests that phonon dispersion plays a dominating role in the gap behavior. However, gap values determined from multiparticle tunneling data exhibited reduced gap magnitudes and a dissimilar crystallographic behavior.
10 citations
4 citations
4 citations
TL;DR: In this article, a multichannel theory of inelastic electron tunneling is developed for calculating the phonon density of states from measurements of the tunneling conductance, which is applied to normal Pb and found to give results in agreement with tunneling data obtained from superconducting.
4 citations
TL;DR: In this paper, the one electron wave function for the impure semiconductor obtained by using the diagram perturbation method, the tunneling current it a model p-n junction is analyzed in the framework of Conley, Duke, Mahan, and Tiemann.
Abstract: On the basis of the one electron wave function for the impure semiconductor obtained by using the diagram perturbation method, the tunneling current it a model p-n junction is analyzed in the framework of Conley, Duke, Mahan, and Tiemann. The expression contains the density of states factor explicitly and a method of determining the density of states tail through tunneling measurements is given. An example is shown on the state density of the (000) valley germanium.
3 citations
TL;DR: In this article, the authors derived an expression for the derivative of the tunneling current with respect to the applied voltage as a function of the superconducting density of states in a superconductor-normal metal junction.
Abstract: Taking into account nonmagnetic energy-loss processes in the barrier as a model for zero-bias anomalies, we derive an expression for the derivative of the tunneling current with respect to the applied voltage as a function of the superconducting density of states in a superconductor-normal metal junction. It is assumed that boson-like excitations are created in the barrier region. The investigations show, that the results of elastic tunneling calculations have to be corrected by a term proportional to an integral over the superconducting density of states.
2 citations