Determination of the dissipation in superconducting Josephson junctions

Journal Article · Sat Feb 07 04:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4906973· OSTI ID:22413035

Ranfagni, A.; Cacciari, I. ^[1]

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1. “Nello Carrara” Institute of Applied Physics, CNR Florence Research Area, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence (Italy)

The results relative to macroscopic quantum tunneling rate, out of the metastable state of Josephson junctions, are examined in view of determining the effect of dissipation. We adopt a simple criterion in accordance to which the effect of dissipation can be evaluated by analyzing the shortening of the semiclassical traversal time of the barrier. In almost all the considered cases, especially those with relatively large capacitance values, the relative time shortening turns out to be about 20% and with a corresponding quality factor Q ≃ 5.5. However, beyond the specific cases here considered, still in the regime of moderate dissipation, the method is applicable also to different situations with different values of the quality factor. The method allows, within the error limits, for a reliable determination of the load resistance R{sub L}, the less accessible quantity in the framework of the resistively and capacitively shunted junction model, provided that the characteristics of the junction (intrinsic capacitance, critical current, and the ratio of the bias current to the critical one) are known with sufficient accuracy.

• OSTI ID: 22413035
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 117; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CAPACITANCE
CRITICAL CURRENT
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
JOSEPHSON JUNCTIONS
METASTABLE STATES
QUALITY FACTOR
SEMICLASSICAL APPROXIMATION
TUNNEL EFFECT