The interactions between polarons and the anharmonic vibrations of the apical oxygen atoms in the normal state of YBa2Cu3O7-δ superconductors have been studied by using a path integral formalism. The temperature effects in the distribution of double-well potentials associated with the anharmonic modes have been taken into account. It is shown that the c-axis electrical resistivity depends linearly on temperature for intermediate values of the overall electron-phonon coupling, whereas strong anharmonicity induces a nonmetallic behavior as a consequence of trapping of the charge carriers.
c-axis resistivity in high-Tc superconductors
ZOLI, Marco
1997-01-01
Abstract
The interactions between polarons and the anharmonic vibrations of the apical oxygen atoms in the normal state of YBa2Cu3O7-δ superconductors have been studied by using a path integral formalism. The temperature effects in the distribution of double-well potentials associated with the anharmonic modes have been taken into account. It is shown that the c-axis electrical resistivity depends linearly on temperature for intermediate values of the overall electron-phonon coupling, whereas strong anharmonicity induces a nonmetallic behavior as a consequence of trapping of the charge carriers.File in questo prodotto:
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