Abstract
We study the effect of interband transitions on the normal-state optical conductivity, dc resistivity, and thermal conductivity along the c-axis, for a plane-chain bilayer cuprate coupled by a perpendicular hopping matrix element (t⊥). When t⊥ is small, the c-axis dc resistivity shows a characteristic upturn as the temperature is lowered, and the c-axis optical conductivity develops a pseudogap at low frequencies. As t⊥ is increased, intraband transitions start to dominate and a more conventional response is obtained. Similar pseudogap behavior is predicted in the thermal conductivity for which strong depression at low temperature is found. Analytical results for a simple plane-plane bilayer are also given, including the frequency sum rule of the optical conductivity.
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Wu, W.C., Atkinson, W.A. & Carbotte, J.P. c-Axis Transport in a Normal-State Bilayer Cuprate and Relation to Pseudogap. Journal of Superconductivity 11, 305–315 (1998). https://doi.org/10.1023/A:1022600421541
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DOI: https://doi.org/10.1023/A:1022600421541