Strain amplification of the 4k$_F$ chain charge instability in Sr$_{14}$Cu$_{24}$O$_{41}$

A. Rusydi; P. Abbamonte; H. Eisaki; Y. Fujimaki; S. Smadici; N. Motoyama; S. Uchida; Y. -J. Kim; M. Ruebhausen; G. A. Sawatzky

paper

Strain amplification of the 4k $_{F}$ chain charge instability in Sr $_{14}$ Cu $_{24}$ O $_{41}$

arXiv:cond-mat/0611730

Abstract

We have used resonant soft x-ray scattering (RSXS) to study the misfit strain in Sr $_{14}$ Cu $_{24}$ O $_{41}$ (SCO), a cuprate that contains both doped spin ladders and spin chains, as well as a "control" sample without holes, La $_{6}$ Ca $_{8}$ Cu $_{24}$ O $_{41}$ (LCCO). The misfit strain wave in SCO is strongly temperature (T)-dependent and is accompanied by a substantial hole modulation. In LCCO the strain wave is weaker, shows no hole modulation, and is T-independent. The observed strain wave vector, $L_{c} = 0.318$ , is close to the 4k $_{F}$ instability of the chain. Our results indicate that the chain charge order observed in SCO by several groups is a 4k $_{F}$ charge density wave (CDW) amplified by the misfit strain in this material. This demonstrates a new mechanism for CDW formation in condensed matter and resolves several contraversies over the transport properties of SCO.

4 pages, 4 figures

Strain amplification of the 4kF​ chain charge instability in Sr14​Cu24​O41​

Abstract

Strain amplification of the 4k $_{F}$ chain charge instability in Sr $_{14}$ Cu $_{24}$ O $_{41}$