Molecular states in strong coupling systems: Soft modes and anomalous resistivity and susceptibility temperature dependence - Nunez Regueiro, M.; Ortiz, G.; Nunez Regueiro, D.; Alascio, B. (Elsevier)
We remark that the resistivity temperature dependence of strong coupled electron-phonon systems like A-15 and C-15 superconductors and CDW compounds is scaled by the energy of the soft modes present in these materials. We then attribute the s-shape to anomalous electron scattering by these soft phonons. We postulate the existence of local entities, the molecular states, formed by a local deformation that creates an attractive potential for the electrons. Depending on the cost of elastic energy compared with the electronic energy gain the distorted state can be the ground state (CDW) or an excited state. Within a simplified exactly solvable model for this last case we calculate the temperature dependence of the resistivity ρ and the susceptibility X, that we compare satisfactory with the experimental results.
http://linkinghub.elsevier.com/retrieve/pii/0921-4534(88)90574-6
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