We report hole-doping dependence of the in-plane resistivity \rho_{ab} in a cuprate superconductor La_{2-x}Sr_{x}CuO_{4}, carefully examined using a series of high-quality single crystals. Our detailed measurements find a tendency towards charge ordering at particular rational hole doping fractions of 1/16, 3/32, 1/8, and 3/16. This observation appears to suggest a specific form of charge order and is most consistent with the recent theoretical prediction of the checkerboard-type ordering of the Cooper pairs at rational doping fractions x = (2m+1)/2^n, with integers m and n.
@article{arxiv.cond-mat/0408483,
title = {Magic Doping Fractions in High-Temperature Superconductors},
author = {Seiki Komiya and Han-Dong Chen and Shou-Cheng Zhang and Yoichi Ando},
journal= {arXiv preprint arXiv:cond-mat/0408483},
year = {2009}
}
Comments
5 pages, 3 figure, resubmitted to Phys. Rev. Lett. The Tc vs. x diagram has been added and the discussions have been modified to focus more on the experimental results