Optical conductivity of CuO_2 infinite-layer films
P. Dore, P. Calvani, G. De Marzi, A. Paolone, S. Lupi (INFM - Dip. di, Fisica, Universita' di Roma La Sapienza, Roma, Italy), G. Balestrino, G., Petrocelli, and R. Desfeux (INFM - Dip. di Scienze Fisiche ed Energetiche,, Universita' di Tor Vergata, Roma, Italy)
TL;DR
This study investigates the infrared optical conductivity of various CuO_2 infinite-layer films, revealing intrinsic polaronic properties of high-temperature superconductors linked to their CuO_2 planes.
Contribution
It provides the first detailed infrared conductivity measurements of CaCuO_2 and SrCuO_{2-y} films, highlighting the presence of extra phonon modes and structured bands related to polaronic effects.
Findings
SrCuO_{2-y} and Sr_{0.85}Nd_{0.15}CuO_2} show extra phonon modes
Structured mid-infrared bands observed in non-stoichiometric films
Polaronic properties are intrinsic to CuO_2 planes
Abstract
The infrared conductivity of CaCuO_2, SrCuO_{2-y}, and Sr_{0.85}Nd_{0.15}CuO_2 infinite-layer films is obtained from reflectivity measurements by taking into account the substrate contribution. SrCuO_{2-y} and Sr_{0.85}Nd_{0.15}CuO_2 exhibit extra-phonon modes and structured bands in the midinfrared, not found in stoichiometric CaCuO_2. These features mirror those observed in the perovskitic cuprates, thus showing that the polaronic properties of high-T_c superconductors are intrinsic to the CuO_2 planes.
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