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In addition to mechanisms already proposed to account for the formation inmanganites of a small-polaron superlattice above the Curie temperature Tc andto a metallic-like sea of large polarons below Tc, we now consider otherobserved colossal-resistance inducing fields, such as magnetic, electric,photon, or strain fields. We attribute the charge-ordered phase formation tothe occurrence of strong dipolar binding of vibronic small polarons arisingfrom the phonon coupling of highly polarizable two-level orbital systems. Thesespecies having associated inherent electric and magnetic off-center dipoles,they couple to the external fields leading to the observed colossal effects.The random phase appears due to polaron band widening in the external field.

Vibronic polarons: comments on a model for the colossal field-resistance effects in manganites