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We present the influence of spin correlation on the metal-insulatortransitions (MIT) in two-orbital Hubbard models by the Kotliar-Ruckensteinslave-boson approach. In the asymmetric half-filling situation, the two orbitssimultaneously transit from conducting to insulating states with the increaseof Coulomb correlation, accompanied by a paramagnetic (PM)-antiferromagnetic(AFM) transition. The orbital selective Mott transition found in the PMcondition is completely suppressed over a wide correlation range, though it mayexist in the systems away from half-filling. In the insulating state, thesystem crosses over from a partially-polarized spin-gapped phase in theintermediate correlation regime to an almost fully-polarized Mott insulatingphase in the strong correlation regime. These results demonstrate that the spinmodulation to the quasiparticle spectra brings much rich and more interestingMIT scenario in multi-orbital correlated systems.

Effect of Spin Correlations on Multi-orbital Metal-Insulator Transitions and Suppression of Orbital Selective Mott Transitions