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28 March 2024
 
  » pubmed » pmid12857158

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Suppression of the charge-density-wave state in Sr14Cu24O41 by calcium doping
T Vuleti? ; B Korin-Hamzi? ; S Tomi? ; B Gorshunov ; P Haas ; T Rõõm ; M Dressel ; J Akimitsu ; T Sasaki ; T Nagata ;
Date 27 Jun 2003
Journal Phys Rev Lett, 90 (25 Pt 1), 257002
AbstractThe 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.
Source PubMed, pmid12857158
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