The Pseudogap Challenge: Understanding the ab-Plane AC Conductivity below Tc

Details The Pseudogap Challenge: Understanding the ab-Plane AC Conductivity below Tc The Pseudogap Challenge: Understanding the ab-Plane AC Conductivity below Tc

2002-08-10

arxiv.org/abs/cond-mat/0208203v2

Phys. Rev. Lett. 90, 187003 (2003)

Physics

Condensed Matter

Superconductivity

Revised figures; 4 pages, 3 figures; submitted to PRL

Scientific paper

10.1103/PhysRevLett.90.187003

We establish that the cuprate pseudogap plays a crucial role in the $ab$-plane optical conductivity $\sigma(\omega,T)$ for temperatures $T \le T_c$. The pseudogap signatures in $\sigma(\omega,T)$ associated with competing proposals of a ``hidden order'' and ``superconducting'' origin for the $d_{x^2 - y^2}$ pseudogap are found to differ in their qualitative $\omega,T$ dependences. For the latter case, as $T$ increases from 0, excess low $\omega$ weight appears; moreover, a much wider range of $\omega$ contributes to form the condensate. We discuss these theories in light of current experiments.

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