Path integrals approach to resisitivity anomalies in anharmonic systems

Details Path integrals approach to resisitivity anomalies in anharmonic systems Path integrals approach to resisitivity anomalies in anharmonic systems

2000-04-19

arxiv.org/abs/cond-mat/0004322v2

Phys.Rev.B Vol.63, 174301 (2001)

Physics

Condensed Matter

Superconductivity

4 figures, to appear in Phys.Rev.B, May 1st (2001)

Scientific paper

10.1103/PhysRevB.63.174301

Different classes of physical systems with sizeable electron-phonon coupling and lattice distortions present anomalous resistivity behaviors versus temperature. We study a molecular lattice Hamiltonian in which polaronic charge carriers interact with non linear potentials provided by local atomic fluctuations between two equilibrium sites. We study a molecular lattice Hamiltonian in which polaronic charge carriers interact with non linear potentials provided by local atomic fluctuations between two equilibrium sites. A path integral model is developed to select the class of atomic oscillations which mainly contributes to the partition function and the electrical resistivity is computed in a number of representative cases. We argue that the common origin of the observed resistivity anomalies lies in the time retarded nature of the polaronic interactions in the local structural instabilities.

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