“Superconductor-Insulator Transition” in a Single Josephson Junction

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1999
Major/Subject
Mcode
Degree programme
Language
en
Pages
1004-1007
Series
Physical Review Letters, Volume 82, Issue 5
Abstract
VI curves of resistively shunted single Josephson junctions with different capacitances and tunneling resistances are found to display a crossover between two types of VI curves: one without and another with a resistance bump (negative second derivative) at zero bias. The crossover corresponds to the dissipative phase transition (superconductor-insulator transition) at which macroscopic quantum tunneling delocalizes the Josephson phase and destroys superconductivity. Our measured phase diagram does not agree with the diagram predicted by the original theory, but does coincide with a theory that takes into account the accuracy of voltage measurements and thermal fluctuations.
Description
Keywords
superconductor, Josephson junction, quantum tunneling
Other note
Citation
Penttilä, J. S. & Parts, Ü. & Hakonen, Pertti J. & Paalanen, M. A. & Sonin, E. B. 1999. “Superconductor-Insulator Transition” in a Single Josephson Junction. Physical Review Letters. Volume 82, Issue 5. 1004-1007. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.82.1004