Schmid, A., & Schön, G. (1975). Linearized kinetic equations and relaxation processes of a superconductor near Tc. J. Low Temp. Phys., 20(1-2), 207–227.
Abstract: Starting from the equation of Gor'kov and Eliashberg in a form introduced by Eilenberger, we derive a set of linearized equations for the deviation from the equilibrium value of the quasiparticle distribution function as well as of the order parameter. These equations resemble the Boltzmann equation and the Ginzburg-Landau equation, respectively, and they form a set of coupled equations. Two different modes can be distinguished, depending on whether the order parameter changes in magnitude or in phase. The equations are solved for the case of a stationary quasiparticle injection into a superconductor and the change in the electrochemical potential of the quasiparticles is calculated. Furthermore, we treat the problem of a current flowing perpendicular to a superconducting-normal interface in which a normal current is converted into a supercurrent, and we calculate the extra resistance of the interface.
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Parker, W. H. (1975). Modified heating theory of nonequilibrium superconductors. Phys. Rev. B, 12(9), 3667–3672.
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Mumma, M., Kostiuk, T., Cohen, S., Bühl, D., & Von Thuna, P. C. (1975). Heterodyne spectroscopy of astronomical and laboratory sources at 8.5 μm using diode laser local oscillators. Space Science Reviews, 17(5), 661–667.
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Gershenzon, E. M., Orlov, L. A., & Ptitsina, N. G. (1975). Absorption spectra in electron transitions between excited states of impurities in germanium. JETP Lett., 22(4), 95–97.
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Gershenzon, E. M., Gurvich, Y. A., Orlova, S. L., & Ptitsina, N. G. (1975). Cyclotron resonance of electrons in Ge in a quantizing magnetic field in the case of inelastic scattering by acoustic phonons. Sov. Phys. JETP, 40(2), 311–315.
Abstract: Results are presented of an experimental study of the linewidth of cyclotron resonance under strong quantization conditions on the scattering of electrons by acoustic phonons. The measurements were performed in the 2....{).4 mm wavelength range at temperatures between 10 and 1.4 OK. A number of singularities were observed in the temperature and frequency dependences of the cyclotron linewidth. These can be ascribed to the effect of inhomogeneous broadening due to nonparabolicity of the electron spectrum, which is renormalized as a result of interaction with acoustic phonons.
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