Quasiparticle injection effects in YBa2Cu3Ox-based planar structures at high operating temperatures

Yu.M. Boguslavskij, K. Joosse, A.G. Sivakov, F.J.G. Roesthuis, G.J. Gerritsma, H. Rogalla

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Abstract

The modulation of the supercurrent Is of a YBCO bridge by the quasiparticle-injection current IG from the YBCO/Au or YBCO/PBCO/Au junctions at temperatures of 60–85 K is determined by two effects: (1) summation of the currents IS and IG in the YBCO bridge, and (2) nonequilibrium suppression of IS by the quasiparticle injection. At a thickness of the PBCO barrier of 40 nm the modulation of IS can be described by the current-summation effect only. For YBCO/Au structures the current gain δIS/δIG increases linearly with decreasing temperature, reaching the value of 2 at 60 K. Numerical simulations of the current- voltage characteristics show an increase of the effective temperature T∗ of the YBCO bridge under injection only at small thicknesses of the PBCO barrier. Visualization of the voltage drop over the junction area by laser scanning microscopy shows a qualitative agreement with the electrical measurements with respect to the current summation and nonequilibrium effects.
Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalPhysica C
Volume220
Issue number1-2
DOIs
Publication statusPublished - 1994

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