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On the temperature dependence of the DC conductivity in disordered materials
Author(s) -
Croitoru N.,
Popescu C.,
Telnic M.,
Vescan L.
Publication year - 1971
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.2220480142
Subject(s) - activation energy , conductivity , condensed matter physics , constant (computer programming) , thermodynamics , field dependence , energy (signal processing) , chemistry , physics , materials science , quantum mechanics , magnetic field , computer science , programming language
The general expression of the conductivity σ( F) = f μ(E, T, F) f 0 ,(E, T, F) g(E) d E is discussed, in which μ(E, T, F) is a generalized mobility which may depend on energy, field, and temperature. It is shown that constant activation energies result for sharply limited energy or mobility gaps and that a continuously temperature dependent activation energy may appear for a tailed‐type product μ(E) g(E) . Expressions of the type σ ∼ exp (— B T −1/n ) may be obtaincd even if the temperature dependence of the mobility is negligible.