Abstract
The -plane optical properties of single crystals have been measured over a wide temperature and frequency range. Below K, where this material undergoes an incoherent-coherent crossover, a new coherent response emerges in the optical conductivity. A spectral weight analysis suggests that this feature originates from high-energy bound states. Below K the scattering rate for this feature is quadratic in temperature, indicating a Fermi-liquid response. Theoretical calculations suggest this crossover is dominated by the orbital. Our results indicate Kondo-type screening is the likely mechanism for the incoherent-coherent crossover in hole-overdoped .
- Received 1 August 2017
DOI:https://doi.org/10.1103/PhysRevB.96.201108
©2017 American Physical Society