corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 90 » Issue 25
< Previous Article | Next Article >

Phys. Rev. Lett. 90, 257002 (2003) [4 pages]

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

Download: PDF (206 kB) Buy this article Export: BibTeX or EndNote (RIS)

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

Received 15 November 2002; published 26 June 2003

The charge response in the spin chain and/or 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 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.257002
DOI:
10.1103/PhysRevLett.90.257002
PACS:
74.72.Jt, 71.45.Lr, 74.25.Nf, 77.22.Gm

*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.

 
< Previous Article | Next Article >