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

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...

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Published in:arXiv.org 2010-06
Main Authors: Wohlfeld, Krzysztof, Oleś, Andrzej M, Sawatzky, George A
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Language:English
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Calcium
Charge density waves
Charge transfer
Ladders
Strontium
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description 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.
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subjects Calcium
Charge density waves
Charge transfer
Ladders
Strontium
title Charge Density Wave in Sr\(_{14-x}\)Ca\(_x\)Cu\(_{24}\)O\(_{41}\)
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