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Colossal Magnetoresistant Materials: The Key Role of Phase Separation
Elbio Dagotto, Takashi Hotta, Adriana Moreo
The study of the manganese oxides, widely known as manganites, that exhibit the ``Colossal'' Magnetoresistance (CMR) effect is among the main areas of research within the area of S…
Origin of Spin Incommensurability in Hole-doped S=1 Chains
Andre Luiz Malvezzi, Elbio Dagotto
Spin incommensurability has been recently experimentally discovered in the hole-doped Ni-oxide chain compound (G. Xu {\it al.}, Science {\bf 289}, 419 (…
Resistivity of Mixed-Phase Manganites
Matthias Mayr, Adriana Moreo, Jose A. Verges +3
The resistivity of manganites is studied using a random-resistor-network, based on phase-separation between metallic and insulating domains. When percolation occurs, both…
Indications of Spin-Charge Separation at Short Distance and Stripe Formation in the Extended t-J Model on Ladders and Planes
G. B. Martins, J. C. Xavier, C. Gazza +2
The recently discussed tendency of holes to generate nontrivial spin environments in the extended two-dimensional t-J model (G. Martins, R. Eder, and E. Dagotto, Phys. Rev. B{\bf 6…
Stripes in the Ising Limit of Models for the Cuprates
G. B. Martins, C. Gazza, E. Dagotto
The hole-doped standard and extended t-J models on ladders with anisotropic Heisenberg interactions are studied computationally in the interval (, Ising;…
Doped Stripes in Models for the Cuprates Emerging from the One-hole Properties of the Insulator
G. B. Martins, C. Gazza, J. C. Xavier +2
The extended and standard t-J models are computationally studied on ladders and planes, with emphasis on the small J/t region. At couplings compatible with photoemission results fo…
Charge-orbital ordering and phase-separation in the two-orbital model for manganites: Roles of Jahn-Teller phononic and Coulombic interactions
Takashi Hotta, Andre Luiz Malvezzi, Elbio Dagotto
The main properties of realistic models for manganites are studied using analytic mean-field approximations and computational numerical methods, focusing on the two-orbital model w…