Journal of Low Temperature Physics

, Volume 146, Issue 1–2, pp 213–226 | Cite as

Influence of Temperature Gradients on Tunnel Junction Thermometry below 1 K: Cooling and Electron–Phonon Coupling

  • J. T. Karvonen
  • L. J. Taskinen
  • I. J. Maasilta
Lammi Workshop on Quantum Phenomena at Low Temperatures

We have studied thermal gradients in thin Cu and AlMn wires, both experimentally and theoretically. In the experiments, the wires were Joule heated non-uniformly at sub-Kelvin temperatures, and the resulting temperature gradients were measured using normal metal-insulator-superconducting tunnel junctions. The data clearly shows that even in reasonably well-conducting thin wires with a short (~10 μm) non-heated portion, significant temperature differences can form. In most cases, the measurements agree well with a model which includes electron–phonon interaction and electronic thermal conductivity by the Wiedemann–Franz law.

Pacs Numbers

73.23.-b 72.10.Di 74.50.+r 

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • J. T. Karvonen
    • 1
  • L. J. Taskinen
    • 1
  • I. J. Maasilta
    • 1
  1. 1.Department of Physics, Nanoscience CenterUniversity of JyväskyläJyväskyläFinland

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