For the paramagnetic insulating phase in the metal-ordered manganite YBaMn2O6, the so-called CE-type of charge/orbital ordered state was observed within the monoclinic ab-plane, which is most commonly observed for the ordinary half doped manganites. However, TEM revealed a 4-fold periodicity along the c-axis, suggesting a new stacking pattern, where planes of the CE-type are built up according to the sequence [aabb...]. Interestingly, when th system enters into the antiferromagnetic state, this stacking pattern changes into [aaaa...] or [abab], suggesting close interplay between spins and orbitals. These features are discusses in terms of inherent structural alternation, i.e., the Y/Ba order along the c-axis.
@article{arxiv.cond-mat/0208518,
title = {New Stacking Variations of the CE-type Structure in the Metal-Ordered Manganite YBaMn2O6},
author = {H. Kageyama and T. Nakajima and M. Ichihara and Y. Ueda and H. Yoshizawa and K. Ohoyama},
journal= {arXiv preprint arXiv:cond-mat/0208518},
year = {2009}
}
Comments
13 pages, figures included, submitted to Journal of the Physical Society of Japan