The motion of small polarons is studied as a function of temperature in the context of a molecular crystal model in which the discreteness of the lattice is accounted for. The polaron bandwidth and the site jump hopping probability have been calculated vs. temperature and dimensionality. The crossover temperature Td* between band-like and hopping motion is reduced in low-dimensional systems due to the enhanced importance of the off-diagonal scattering processes. We discuss the relevance of the model to high-Tc superconductors in which polaronic features in the transport properties have been pointed out [M. Zoli, Phys. Rev. B 53 (1996) 9074; M. Zoli, Phys. Rev. B 56 (1997) 111].
Hopping polaronic motion in high-Tc superconductors
ZOLI, Marco
1999-01-01
Abstract
The motion of small polarons is studied as a function of temperature in the context of a molecular crystal model in which the discreteness of the lattice is accounted for. The polaron bandwidth and the site jump hopping probability have been calculated vs. temperature and dimensionality. The crossover temperature Td* between band-like and hopping motion is reduced in low-dimensional systems due to the enhanced importance of the off-diagonal scattering processes. We discuss the relevance of the model to high-Tc superconductors in which polaronic features in the transport properties have been pointed out [M. Zoli, Phys. Rev. B 53 (1996) 9074; M. Zoli, Phys. Rev. B 56 (1997) 111].I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
