Influence of temperature gradients on tunnel junction thermometry below 1 K: cooling and electron-phonon coupling

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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 ($\sim 10 μ$m) 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.
J. Low Temp. Phys. in press

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Mesoscale and Nanoscale Physics, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/122484

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0607809
 http://arxiv.org/abs/cond-mat/0607809
 J. Low Temp. Phys. 146, 213 (2007)
 doi:10.1007/s10909-006-9264-y

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arXiv