Unveiling New Magnetic Phases of Undoped and Doped Manganites

Abstract

Novel ground-state spin structures in undoped and lightly-doped manganites are here investigated based on the orbital-degenerate double-exchange model, by using 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, suggesting that large magneto-resistant effects could exist even in undoped Mn oxides. For doped layered manganites, the phase diagram includes another new AFM phase of the ${\mathrm{C}}_{\mathrm{x}}{\mathrm{E}}_{1-\mathrm{x}}$-type. Experimental signatures of the new phases are discussed.

Revision of text and figures

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