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Schmid, Albert; Schön, Gerd |
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Linearized kinetic equations and relaxation processes of a superconductor near Tc |
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1975 |
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J. Low Temp. Phys. |
Abbreviated Journal |
J. Low Temp. Phys. |
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20 |
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1-2 |
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207-227 |
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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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922 |
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Author |
Shklovskij V.A. |
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Title |
Hot Electrons in Metals at Low Temperatures |
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Journal Article |
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1980 |
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J. Low Temp. Phys. |
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41 |
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375-396 |
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Hot electrons in metals at helium temperatures under steady conditions can be produced by passing an electric current of moderate density through thin, narrow (-1 μm wide) metallic films in good thermal contact with bulk single-crystal dielectric substrates. This paper is concerned with the theory of hot electrons in normal metals at low temperatures (when θ<< θ(D), where θ is the average electron energy and θ(D) is the Debye temperature). The theory is formulated in terms of realistic electron and phonon dispersion laws, taking into account the experimental possibility of heat removal from the sample. In the case in which the temperature approximation of Kagnov, Lifshitz, and Tanatarov is not satisfied when elastic scattering of electrons is dominant in a steady state electric field, the kinetic equation is derived for the energy-dependent, hot electron distribution function, which determines the associated nonlinear responses. The solution of this equation is discussed for a simple model. It is shown that the experimental information on the electron-phonon interaction in a metal can be obtained in terms of the well-known spectral functions. This is illustrated by experiments determining the nonlinear field dependence of the resistance, by tunnel experiments, and by critical current hysteresis measurements (for superconducting metals). Theoretical estimates which support the observability of the effects underdiscussion are presented. |
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RPLAB @ atomics90 @ |
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957 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Elantiev, A. I.; Karasik, B. S.; Potoskuev, S. E. |
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Title |
Intense electromagnetic radiation heating of electrons of a superconductor in the resistive state |
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1988 |
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Sov. J. Low Temp. Phys. |
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Sov. J. Low Temp. Phys. |
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14 |
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7 |
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414-420 |
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HEB |
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Duplicated as 1697 |
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236 |
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Cherednichenko, S.; Drakinskiy, V. |
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Low noise hot-electron bolometer mixers for terahertz frequencies |
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2008 |
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J. Low Temp. Phys. |
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J. Low Temp. Phys. |
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151 |
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1-2 |
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575-579 |
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HEB, mixer, gain bandwidth, MgB2 |
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Hot-electron bolometer (HEB) mixers are used in many low noise heterodyne radio astronomical receivers. Their noise temperature is at the level of 10–15 times the quantum limit. However, their gain bandwidth is a serious limiting factor. Here we review the state of the art of the HEB mixers gain bandwidth for different materials and substrates. We compare the gain bandwidth of HEB mixers made on bulk substrates and thin membranes. Finally, results for MgB2 thin films for broadband HEB mixers are discussed. |
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0022-2291 |
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RPLAB @ lobanovyury @ |
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553 |
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Elant'ev, A. I.; Karasik, B. S. |
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Effect of high-frequency current on Nb superconductive film in resistive state |
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1989 |
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Sov. J. Low Temp. Phys. |
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Sov. J. Low Temp. Phys. |
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15 |
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7 |
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379-383 |
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Nb HEB |
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882 |
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