Peter W. Hawkes (Ed.)'s Advances in Electronics and Electron Physics, Vol. 70 PDF

By Peter W. Hawkes (Ed.)

ISBN-10: 0120146703

ISBN-13: 9780120146703

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17, assuming two superconducting electrodes with the energy gaps A1 and A,, respectively. At T = 0 the tunneling current remains zero until a discontinuous jump occurs at the voltage V = (Al + A2)/e. Following this jump, the current gradually approaches the normal tunneling characteristic (curve I , ) obtained when both electrodes are in the normal state. At T > 0 thermally excited quasiparticles result in a tunneling current also at voltages smaller than (Al + A,)/e. Now the tunneling current peaks at V = [ A , - A,l/e and rises sharply again at V = [A,(T) + A,(T)]/e approaching the curve I , .

1974). For simplicity, these authors assumed a one-dimensional geometry where the transverse sample dimension is small compared to the thermal healing length. Their experiments essentially confirmed the details of their theoretical analysis, including the highly nonlinear IVC associated with the generation of a hotspot. Subsequent experiments on wider films (Huebener, 1975) have shown that the onedimensional model also applies reasonably well to geometries that are not strictly one-dimensional any more.

IN SUPERCONDUCTING MICROBRIDGES VIII. HOTSPOTS In a thin-film superconductor, electric current can flow without energy dissipation only up to a distinct critical value. If the critical current is exceeded, a resistive voltage appears. The onset of this voltage is due to the process of phase slippage and flux flow (Huebener, 1979). If the current is increased further, the energy dissipation eventually becomes large enough such that one or more self-heating hotspots develop locally (possibly resulting in the destruction of the superconductor).

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Advances in Electronics and Electron Physics, Vol. 70 by Peter W. Hawkes (Ed.)

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