The electronic structures of Sr_{14-x}Ca_{x}Cu24O41 are calculated within the local density approximation. Around the Fermi energy there exist quasi-one-dimensional bands originated from the ladder and chain layers. The nearest-neighbor inter-ladder hoppings are estimated to be 5--20% of the intra-ladder ones. Possible effects of Ca substitution on electronic structures and charge distribution are also discussed.
@article{arxiv.cond-mat/9706049,
title = {Electronic Structures of Sr_{14-x}Ca_{x}Cu24O41},
author = {M. Arai and T. Tsunetsugu},
journal= {arXiv preprint arXiv:cond-mat/9706049},
year = {2009}
}