### 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 language | English (US) |
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Pages (from-to) | 1865-1873 |

Number of pages | 9 |

Journal | Physical Review B |

Volume | 10 |

Issue number | 5 |

DOIs | |

State | Published - 1974 |

### ASJC Scopus subject areas

- Condensed Matter Physics

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## Cite this

*Physical Review B*,

*10*(5), 1865-1873. https://doi.org/10.1103/PhysRevB.10.1865