Effect of thermal noise on current-voltage characteristics of Josephson junctions

C. M. Falco, W. H. Parker, S. E. Trullinger, Paul K. Hansma

Research output: Contribution to journalArticle

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Abstract

Measurements are reported of the current-voltage (I-V) characteristics of externally shunted oxide-barrier tunnel junctions at temperatures T and critical currents Ic such that the Josephson coupling energy (2e)Ic is comparable to the thermal energy k T. The measurements are in complete quantitative agreement with the theory of Ambegaokar and Halperin in the limit that the dimensionless parameter βc=(2e) (IcCσ2)1, where C is the capacitance and σ the total conductance of the shunted junction. Measurements for larger values of βc are in qualitative agreement with the theory of Kurkijärvi and Ambegaokar. In addition, the Ambegaokar-Halperin theory is generalized to include the cos pair-quasiparticle interference term. It is concluded that a measurement of the cos term using only the I-V characteristic will be difficult.

Original languageEnglish (US)
Pages (from-to)1865-1873
Number of pages9
JournalPhysical Review B
Volume10
Issue number5
DOIs
StatePublished - 1974

ASJC Scopus subject areas

  • Condensed Matter Physics

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