Suppression of the Charge-Density-Wave State in [Formula presented] by Calcium Doping

T. Vuletić, B. Korin-Hamzić, S. Tomić, B. Gorshunov, P. Haas, T. Rõõm, M. Dressel, Jun Akimitsu, T. Sasaki, T. Nagata

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Abstract

The charge response in the spin chain and/or ladder compound [Formula presented] 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 [Formula presented] to 10 K for [Formula presented], 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 interladder 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.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Volume90
Issue number25
DOIs
Publication statusPublished - Jan 1 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Vuletić, T., Korin-Hamzić, B., Tomić, S., Gorshunov, B., Haas, P., Rõõm, T., Dressel, M., Akimitsu, J., Sasaki, T., & Nagata, T. (2003). Suppression of the Charge-Density-Wave State in [Formula presented] by Calcium Doping. Physical Review Letters, 90(25). https://doi.org/10.1103/PhysRevLett.90.257002