https://doi.org/10.1007/s100510050552
Temperature dependence of the anisotropic electrodynamics in the ladder compounds Sr14-xCaxCu24O41
1
Laboratorium für Festkörperphysik ETH-Zürich,
8093 Zürich, Switzerland
2
Laboratoire de Chimie des Solides, Bâtiment 414, Université de Paris-Sud,
91405 Orsay Cedex, France
3
II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
Corresponding author: a degiorgi@solid.phys.ethz.ch
Received:
18
June
1998
Accepted:
17
July
1998
Published online: 15 December 1998
The optical reflectivity as a function of temperature of the title compound for x = 0,5 and 12 has been measured over a broad spectral range from 4 meV up to 12 eV. Our findings suggest a very anisotropic dynamics of the charge excitation spectrum when measuring along or perpendicular to the ladders. Moreover, a metal-insulator transition develops at low temperatures, leading to a suppression of Drude spectral weight in the far and mid-infrared spectral range. We identify this behaviour as a consequence of the localization effects for small Ca substitution, and of the possible formation of a charge density wave condensate for large Ca substitution.
PACS: 78.20.-e – Optical properties of bulk materials and thin films / 74.72.Jt – Other cuprates
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998