Interband effects in the c-axis optical conductivity in YBaCuO

Abstract

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 $t_{\perp }^2$.

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

References in corpus (2)

• Model of C-Axis Resistivity of High-$\Tc$ Cuprates
• Antiferromagnetic Excitations and Van Hove Singularities in YBa${}_2$Cu${}_3$O${}_{6+x}$

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• C-axis Raman spectra of a normal plane-chain bilayer cuprate and the pseudogap
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• Effect of Interband Transitions on the c axis Penetration Depth of Layered Superconductors
• Normal-state magnetic susceptibility in a bilayer cuprate
• The role of intermediate layers in the c-axis conductivity of layered superconductors