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In this report, we study in detail the competitor to the FM metallic state atelectronic density $x=1/4$ in the CMR regime using the two-orbitaldouble-exchange model with Jahn-Teller lattice distortions on two-dimensionalclusters, employing a very careful large-scale cooling down process in theMonte Carlo simulations to avoid being trapped in metastable states. Ourinvestigations show that this competing insulator has a very unexpected complexstructure, involving diagonal stripes with alternating regions with FM andCE-like order. The level of complexity of this new state even surpasses that ofthe recently unveiled spin-orthogonal-stripe states and their associated highdegeneracy. This new state complements the long-standing scenario of phaseseparation, since the alternating FM-CE pattern appears even in the presentstudy which is carried out in the clean limit. The present and recentinvestigations are also in agreement with the many "glassy" characteristics ofthe CMR state found experimentally, due to the high degeneracy of theinsulating states involved in the process. Results for the spin-structurefactor of the new states are also here provided to facilitate the analysis ofneutron scattering experiments for these materials.

Complex State Found in the CMR Regime of Models for Colossal Magnetoresistive Manganites