Abstract
It has been suggested by several authors that in Fe3O4 and the vanadium bronzes (e.g. Na x V2O5) the current carriers are small or intermediate polarons, heavy enough to “crystallize” at low temperatures. This hypothesis is examined in detail, the interaction between polarons and the effect of a high concentration on the polaron’s energy and mass being discussed. In Fe3O4 it is suggested that there is no contradiction between this model and the “band” model of Cullen and Callen [1]. In Na x V2O5 for most values of x which are not a simple fraction of the number of sites, the condensed phase must be disordered (a “ polaron glass”) and the high linear specific heat at low temperatures is related to the disorder. The blue bronze K0.3MoO3 has electrical properties similar to F3O4, though the conductivity is higher and the low magnetic susceptibilities suggest polaron pairing. The relationship of the sharp transition to the Néel point in some “amorphous antiferromagnetics”, and to the Wigner transition is discussed.
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Mott, N.F. (1973). Some Problems about Polarons in Transition Metal Compounds. In: Haken, H., Wagner, M. (eds) Cooperative Phenomena. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-86003-4_1
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