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Is thermal conductivity time‐dependent?
Author(s) -
Hüttner Bernd
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200844182
Subject(s) - thermal conductivity , wiedemann–franz law , brownian motion , condensed matter physics , conductivity , statistical physics , thermodynamics , materials science , displacement (psychology) , thermal , physics , quantum mechanics , psychology , psychotherapist
The question whether thermal conductivity may be time dependent on short time scales is investigated and answered in the affirmative. For this purpose, we make use of a classical relation between the Brownian mean displacement and the thermal conductivity. Interestingly, the transition from the time dependent regime to stationary behaviour is in the vicinity of Allen's temperature relaxation time. Calculation of the electronic temperature, when the new time dependent thermal conductivity is used, shows an improvement in the results derived by means of the two‐temperature model. Furthermore, the Wiedemann–Franz law is not valid in the time regime investigated. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)