On the General Physics of Heat Conduction in Ordered and Disordered Solids
Heat conduction is temperature times entropy transport. In good crystalline material both the entropy content and transport is contained in the same entity i.e. phonon. In disordered systems there may be localized excitations as well as collective excitations; in this case heat can be transported both by hopping (diffusion) of entropy between localized states or by the collective excitations, which may be sound waves, spin waves or the like. In this latter case, the heat current can be thought of as a mixture of “ballistic” (i.e. collective) and “stochastic” (i.e. hopping) transport. Some history and general phenomenological features are discussed.
KeywordsCollective Excitation Entropy Transfer Localize Excitation Total Thermal Conductivity Phonon Transport
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