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

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Boguslavskij, Yu.M. and Joosse, K. and Sivakov, A.G. and Roesthuis, F.J.G. and Gerritsma, G.J. and Rogalla, H. (1994) Quasiparticle injection effects in YBa2Cu3Ox-based planar structures at high operating temperatures. Physica C: Superconductivity, 220 (1-2). pp. 195-202. ISSN 0921-4534

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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 ¿IS/¿IG 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.
Item Type:Article
Copyright:© 1994 Elsevier Science
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/23804
Official URL:http://dx.doi.org/10.1016/0921-4534(94)90901-6
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