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Magnetic field dependence of the current-voltage curve of a superconducting single electron transistor in a high impedance environment

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<mark>Journal publication date</mark>1996
<mark>Journal</mark>Czechoslovak Journal of Physics
Issue number4
Volume46
Number of pages2
Pages (from-to)2291-2292
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A superconducting single electron transistor has been investigated in a regime where its behavior is governed by the interplay of charging and Josephson effects with the corresponding energies Ec and EJ, respectively. Using a SQUID geometry, we were able to change the ratio of EJ/Ec (from EJ/Ec≈3.5 to EJ/Ec≈0.44). In zero magnetic field, we observed a sharp Coulomb blockade at low current followed by a negative slope of the I–V curve at higher current. Applying an external magnetic field perpendicular to the substrate and thus decreasing EJ/Ec we observed an increase of the blockade voltage from 10 μV up to 45 μV and a decrease of the crossover current from 5 nA down to 0.5 nA. Such a behavior of the transistor can be explained using a Bloch band picture.