Phys. Rev. Lett. 90, 247203 (2003) [4 pages]Unveiling New Magnetic Phases of Undoped and Doped ManganitesReceived 2 September 2002; published 17 June 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.247203
DOI:
10.1103/PhysRevLett.90.247203
PACS:
75.47.Gk, 75.10.–b, 75.30.Kz, 75.50.Ee
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