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A Boltzmann-equation approach for the calculation of the I - V characteristics of superconducting constrictions is presented. This technique allows for the inclusion of normal scattering as well as Andreev reflection processes in the constriction. The computed I - V characteristics exhibit...
The saturation magnetization M s , the uniaxial anisotropy K u , the optical absorption α , the Faraday rotation θ F , and the Faraday ellipticity ψ F of epitaxial garent films of composition Y 3 - x Bi x Fe 5 O 12 and Y 3 - y Pb y Fe 5 O 12 have been investigated for x ≤ 1.7 and y ≤ 0.25...
Detailed magnetization curves show a first-order phase transition in single-crystal Er Rh 4 B 4 at H c 2 for the temperature range 3.3 ≳ T ≳ 1.4 K when the field is parallel to the a axis, along which the crystal shows strong paramagnetism. Below 3.3 K, the discontinuity in magnetization at H...
The (presumably ionic) electrical conductivity σ of K 0.4 Bi 0.6 F 2.2 single crystals has been measured as a function of temperature, yielding Arrhenius-type behavior over a temperature range of ∼ 300°C with an activation energy of 0.389 eV. Doping the crystals with Th 4 + and Pb 2 + is...
Angle-resolved normal-emission photoelectron spectra of Cu(110) are calculated within the frame of the three-step model of photoemission with spin-orbit interaction included. Corresponding experimental spectra for linearly polarized light ( ℏ ω = 21.22 eV) are presented and good agreement...
We study in detail, within the adiabatic approximation for the structural degrees of freedom and on exact grounds for the magnetic ones, the d = 1 magnetostrictive spin-½ XY model in the presence of an external magnetic field along the z axis. We calculate the specific heat, magnetization,...
We study a long-range quantum spin-glass model with uniaxial anisotropy. A calculation of the phase diagram as well as the susceptibilities above the freezing temperature is presented. For easy-axis systems Ising-like behavior is found, while for easy-plane systems with increasing anisotropy a...
Analyses of He-diffraction data show that the oxygen adatoms produce well-separated corrugation hills with the same height and width in both the p ( 2 × 2 ) and c ( 2 × 2 ) phases on Ni(100). This confirms that oxygen chemisorbs in both phases in the same crystallographic and electronic...
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