Suppression of the Charge-Density-Wave State in Sr14Cu24O41 by Calcium Doping

T. Vuletić, B. Korin-Hamzić, S. Tomić, B. Gorshunov, P. Haas, T. Rõõm, M. Dressel, J. Akimitsu, T. Sasaki, and T. Nagata
Phys. Rev. Lett. 90, 257002 – Published 26 June 2003

Abstract

The charge response in the spin chain and/or ladder compound Sr14xCaxCu24O41 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 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.

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  • Received 15 November 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.257002

©2003 American Physical Society

Authors & Affiliations

T. Vuletić*, B. Korin-Hamzić, and S. Tomić

  • Institut za fiziku, P.O. Box 304, HR-10001 Zagreb, Croatia

B. Gorshunov, P. Haas, T. Rõõm§, and M. Dressel

  • 1. Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany

J. Akimitsu, T. Sasaki, and T. Nagata

  • Department of Physics, Aoyama-Gakuin University, Tokyo, Japan

  • *Electronic address: tvuletic@ifs.hr
  • URL: http://www.ifs.hr/real_science
  • Permanent address: General Physics Institute, Russian Academy of Sciences, Moscow, Russia.
  • §Permanent address: National Institute of Chemical Physics and Biophysics, Tallinn, Estonia.

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Vol. 90, Iss. 25 — 27 June 2003

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