Suppression of the charge-density-wave state in Sr14Cu24O41 by calcium doping
T. Vuletic, B. Korin-Hamzic, S. Tomic, B. Gorshunov, P. Haas, T. Room, M. Dressel, J. Akimitsu, T. Sasaki, T. Nagata
Abstract
The charge response in the spin chain/ladder compound Sr14-xCaxCu24O41 is characterized by DC resistivity, low-frequency dielectric spectroscopy and optical spectroscopy. We identify a phase transition below which a charge-density wave (CDW) develops in the ladder arrays. Calcium doping suppresses this phase with the transition temperature decreasing from 210 K for x=0 to 10 K for x=9, and the CDW gap from 130 meV down to 3 meV, respectively. This suppression is due to the worsened nesting originating from the increase of the inter-ladder tight-binding hopping integrals, as well as from disorder introduced at the Sr sites. These results altogether speak in favor of two-dimensional superconductivity under pressure.
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