title: Unveiling new magnetic phases of undoped and doped manganites.
abstract: Novel ground-state spin structures in undoped and lightly doped manganites are investigated based on the orbital-degenerate double-exchange model, via mean-field and numerical techniques. In undoped manganites, a new antiferromagnetic (AFM) state, called the E-type phase, is found adjacent in parameter space to the A-type AFM phase. Its structure is in agreement with recent experimental results. This insulating E-AFM state is also competing with a ferromagnetic metallic phase as well. For doped layered manganites, the phase diagram includes another new AFM phase of the CxE1-x type. Experimental signatures of the new phases are discussed.
authors.affiliation: Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Hotta
authors.forename: Mohammad
authors.initials: M
authors.lastname: Moraghebi
authors.forename: Adrian
authors.initials: A
authors.lastname: Feiguin
authors.forename: Adriana
authors.initials: A
authors.lastname: Moreo
authors.forename: Seiji
authors.initials: S
authors.lastname: Yunoki
authors.forename: Elbio
authors.initials: E
authors.lastname: Dagotto