1211.0112 (Zi-Jian Yao et al.)

Theory for charge and orbital density wave states in manganite
La$_{0.5}$Sr$_{1.5}$MnO$_4$    [PDF]

Zi-Jian Yao, Wei-Qiang Chen, Jin-Hua Gao, Hong-Min Jiang, Fu-Chun Zhang

We propose that the high temperature disordered phase in manganites may be described by spinless $e_g$ electrons. The interactions of spinless electrons may lead to charge and orbital ordered states. Our theory explains the Fermi surface probed in angle resolved photoemission spectroscope and the observed simultaneous phase transition to charge and orbital ordered state in La$_{0.5}$Sr$_{1.5}$MnO$_4$. The orbital orderings are shown to be $d_{x^2-y^2} \pm d_{3z^2-r^2}$.

View original: http://arxiv.org/abs/1211.0112