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The metal-insulator transition, and the associated magnetic transition, inthe colossal magnetoresistance (CMR) regime of the one-orbital model formanganites is here studied using Monte Carlo (MC) techniques. Both cooperativeoxygen lattice distortions and a finite superexchange coupling among the$t_{\rm 2g}$ spins are included in our investigations. Charge and spincorrelations are studied. In the CMR regime, a strong competition between theferromagnetic metallic and antiferromagnetic charge-ordered insulating statesis observed. This competition is shown to be important to understand theresistivity peak that appears near the critical temperature. Moreover, it isargued that the system is dynamically inhomogeneous, with short-range chargeand spin correlations that slowly evolve with MC time, producing the glassycharacteristics of the CMR state. The local density-of-states (LDOS) is alsoinvestigated, and a pseudogap (PG) is found to exist in the CMR temperaturerange. The width of the PG in the LDOS is calculated and directly compared withrecent scanning-tunneling-spectroscopy (STS) experimental results. Theagreement between our calculation and the experiment suggests that thedepletion of the conductance at low bias observed experimentally is areflection on the existence of a PG in the LDOS spectra, as opposed to a hardgap. The apparent homogeneity observed via STS techniques could be caused bythe slow time characteristics of this probe. Faster experimental methods shouldunveil a rather inhomogeneous state in the CMR regime, as already observed inneutron scattering experiments.

Study of Short-distance Spin and Charge Correlations and Local Density-of-States in the CMR regime of the One-Orbital Model for Manganites