Interband effects in the c-axis optical conductivity in YBaCuO

Details Interband effects in the c-axis optical conductivity in YBaCuO Interband effects in the c-axis optical conductivity in YBaCuO

1996-08-27

arxiv.org/abs/cond-mat/9608137v1

Phys. Rev. B 55, 3230 (1997).

Physics

Condensed Matter

12 Pages, 9 postscript figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.55.3230

The normal state optical conductivity is calculated for a layered metal with two layers per unit cell coupled through a transverse hopping matrix element $t_\perp$. The optical response involves an interband term in addition to the more familiar intraband term which leads to the usual Drude form. The interband term is only weakly temperature dependent, even for an inelastic scattering rate which is linear in T. It gives a $c$-axis response which extends in frequency over the entire band width although there can be structure on this energy scale which reflects details of the electronic structure. In particular, at low energy, the $c$-axis response can develop a gap or pseudogap as the temperature is lowered. At high temperature, a Drude response will be seen only if the intraband transitions, which are of order $t_\perp^4$, become important compared with the interband transitions which are of order $t_\perp^2$.

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