Charge Density Wave in Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$

Abstract

Recent experimental results [A. Rusydi et al., Phys. Rev. Lett. 97, 016403 (2006)] revealed the stability of a peculiar charge density wave (CDW) with odd period (three or five) in the coupled Cu${}_2$O${}_5$ spin ladders in Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$, while the CDW with even period is unstable. Here we resolve this contradiction by solving the effective t-J model for the two coupled chains supplemented by the intersite interaction term V. Crucial to this finding is the novel interaction term V (responsible for the interladder repulsion between nearest neighbor holes), which is derived from the on-site Hubbard-like repulsion between electrons on the same oxygen sites but within two distinct orbitals which belong to two neighboring Cu${}_2$O${}_5$ ladders in the charge transfer model.

4 pages, 3 figures

References in corpus (2)

• Unidirectional d-wave superconducting domains in the two-dimensional t-J model
• Origin of charge density wave in the coupled spin ladders in Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$

Cited by in corpus (1)

• Pair Density Waves in coupled doped two-leg Ladders