Temperature dependent effects on the electronic structure, resistivity andelectron-phonon coupling of HgBa2CuO4

The electronic structure of HgBa2CuO4 is calculated for some lattice distor tions. This compound has only one Fermi Surface (FS) structure (barrel) and is supposedly typical for several high-T-c oxides with very two-dimensiona l bands. This makes the electron-phonon coupling (lambda) sensitive to some modes. The electronic structure changes with atomic displacements so that the coupling becomes non-linear. The large anisotropy, making the material almost insulating in the z-direction, is found to be essential for weak scr eening during phonon movements. These effects contribute to large lambda an d unusual T-dependence of the resistivity. (C) 1998 Elsevier Science Ltd. A ll rights reserved.