Transversely Modulated Structure of Charge-Orbital Ordered Manganites

Magnetic, orbital and charge ordering in the electron-doped manganites

The three dimensional perovskite manganites R1−xAxMnO3 in the range of holedoping x > 0.5 are studied in detail using a double exchange model with degenerate eg orbitals including intraand inter-orbital correlations and near-neighbour Coulomb repulsion. We show that such a model captures the observed phase diagram and orbital-ordering in the intermediate to large band-width regime. It is argued...

Orbital Effects in Manganites

We review some aspects related to orbital degrees of freedom in manganites. The Mn ions in these compounds have double orbital degeneracy and are strong Jahn-Teller ions, causing structural distortions and orbital ordering. We discuss ordering mechanisms and the consequences of orbital order. The additional degeneracy of low-energy states and the extreme sensitivity of the chemical bonds to the...

Complex orbital state in manganites

The eg-orbital states with complex coefficients of the linear combination of x2 − y2 and 3z2 − r2 are studied for the ferromagnetic state in doped manganites. Especially the focus is put on the competition among uniform complex, staggered complex, and real orbital states. As the hole-doping x increases, the real, the canted complex, and the staggered complex orbital states appears successively....

Investigation of the electronic structure of the charge-ordered phase in epitaxial and polycrystalline La1−xCaxMnO3 (x=0.55,0.67) perovskite manganites

Staircase effect in metamagnetic transitions of charge and orbitally ordered manganites

Staircase effect in metamagnetic transitions of charge and orbitally ordered manganites. Abstract This paper reports on peculiar metamagnetic transitions which take place in antiferromagnetic, charge and orbitally ordered (AFCOO) manganites. At very low temperatures, the virgin magnetization curves of some of these compounds exhibit several, sharp steps giving rise to a staircase-like shape. Th...