Suppression of the charge-density-wave state in Sr_14Cu_24O_41 by calcium doping

Details Suppression of the charge-density-wave state in Sr_14Cu_24O_41 by calcium doping Suppression of the charge-density-wave state in Sr_14Cu_24O_41 by calcium doping

2003-05-08

arxiv.org/abs/cond-mat/0305159v2

Phys. Rev. Lett. 90, 257002 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.90.257002

The charge response in the spin chain/ladder compound Sr_14-xCa_xCu_24O_41 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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