Charge density wave in the spin ladder of Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$

TL;DR

This paper demonstrates how a multiband charge transfer model explains the formation of charge density waves in Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$, with periodicity varying with doping, using a Hartree-Fock approach.

Contribution

It introduces a multiband charge transfer model and shows that purely electronic interactions can stabilize charge density waves in the spin ladder of the material.

Findings

Charge density wave periodicity depends on doping levels.

Purely electronic interactions can stabilize charge density waves.

The model aligns with recent experimental observations.

Abstract

We consider a multiband charge transfer model for a single spin ladder describing the holes in Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$. Using Hartree-Fock approximation we show how the charge density wave, with its periodicity dependent on doping as recently observed in the experiment, can be stabilized by purely electronic many-body interactions.