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Nanoscale Phase Separation in Colossal Magnetoresistance Materials: A Lesson for the Cuprates?
Elbio Dagotto, Jan Burgy, Adriana Moreo
A recent vast experimental and theoretical effort in manganites has shown that the colossal magnetoresistance effect can be understood based on the competition of charge-ordered an…
Study of Percolative Transitions with First-Order Characteristics in the Context of CMR Manganites
J. Burgy, M. Mayr, E. Dagotto
The unusual magneto-transport properties of manganites are widely believed to be caused by mixed-phase tendencies and concomitant percolative processes. However, dramatic deviation…
Pseudogap Formation in an Electronic System with d-wave Attraction at Low-density
Takashi Hotta, Matthias Mayr, Elbio Dagotto
On the basis of an electronic model with separable attractive interaction, the precursors at high temperature and strong coupling of the d-wave superconducting state are investigat…
Hole-Pairs in a Spin Liquid: Influence of Electrostatic Hole-Hole Repulsion
C. Gazza, G. Martins, J. Riera +1
The stability of hole bound states in the t-J model including short-range Coulomb interactions is analyzed using computational techniques on ladders with up to sites.…
Ferromagnetism in Electronic Models for Manganites
Jose Riera, Karen Hallberg, Elbio Dagotto
Ground state properties of the Kondo model for manganese oxides in one dimension are studied using numerical techniques. The large Hund coupling () limit is specially analyz…
One particle spectral weight of the three dimensional single band Hubbard model
M. Ulmke, R. T. Scalettar, A. Nazarenko +1
Dynamic properties of the three-dimensional single-band Hubbard model are studied using Quantum Monte Carlo combined with the maximum entropy technique. At half-filling, there is a…
Photoemission Spectra in t-J Ladders with Two Legs
Stephan Haas, Elbio Dagotto
Photoemission spectra for the isotropic two-leg t-J ladder are calculated at various hole-doping levels using exact diagonalization techniques. Low-energy sharp features caused by…
Hole Dispersion and Symmetry of the Superconducting Order Parameter for Underdoped CuO Bilayers and 3D Antiferromagnets
Alexander Nazarenko, Elbio Dagotto
We calculate the dispersion of a hole in bilayers and 3D antiferromagnets, using the self-consistent Born approximation (SCBA) to the model. Superconductivity a…
Electronic Hamiltonian for Transition Metal Oxide Compounds
Erwin Müller-Hartmann, Elbio Dagotto
An effective electronic Hamiltonian for transition metal oxide compounds is presented. For Mn-oxides, the Hamiltonian contains spin-2 ``spins'' and spin-3/2 ``holes'' as degrees of…
Rapid Suppression of the Spin Gap in Zn-doped CuGeO_3 and SrCu_2O_3
George Martins, Elbio Dagotto, José Riera
The influence of non-magnetic impurities on the spectrum and dynamical spin structure factor of a model for CuGeO is studied. A simple extension to Zn-doped …
Spontaneous Coherence and Collective Modes in Double-Layer Quantum Dot Systems
Jun Hu, E. Dagotto, A. H. MacDonald
We study the ground state and the collective excitations of parabolically-confined double-layer quantum dot systems in a strong magnetic field. We identify parameter regimes where…
Influence of Hole Doping on Antiferromagnetic Real-Space Approaches for the High-Tc Cuprates
Alexander Nazarenko, Stephan Haas, Jose Riera +2
Recently proposed scenarios for the cuprates make extensive use of a ``flat'' quasiparticle (q.p.) dispersion and short-range hole-hole interactions in real-space, both caused by a…
Spin dynamics of SrCuO and the Heisenberg ladder
A. W. Sandvik, E. Dagotto, D. J. Scalapino
The Heisenberg antiferromagnet in the ladder geometry is studied as a model for the spin degrees of freedom of SrCuO. The susceptibility and the spin echo decay rat…
Superconductivity in the Cuprates as a Consequence of Antiferromagnetism and a Large Hole Density of States
E. Dagotto, A. Nazarenko, A. Moreo +1
We briefly review a theory for the cuprates that has been recently proposed based on the movement and interaction of holes in antiferromagnetic (AF) backgrounds. A robust peak in t…
Heavy Quasiparticles in the Anderson Lattice Model
K. Tsutsui, Y. Ohta, R. Eder +3
An exact-diagonalization technique on small clusters is used to study the dynamics of the one-dimensional symmetric Anderson lattice model. Our calculated excitation spectra reprod…
Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
E. Dagotto, T. M. Rice
One way of making the transition between the quasi-long range order in a chain of S=1/2 spins coupled antiferromagnetically and the true long range order that occurs in a plane, is…
A Model of Correlated Fermions with Superconductivity
Alexander Nazarenko, Adriana Moreo, Jose Riera +1
Motivated by the phenomenology of the high-Tc cuprates, a two dimensional fermionic model with attractive interactions is here discussed. The exact solution to the two particle pro…
Spin Dynamics of Hole Doped
E. Dagotto, J. Riera, A. Sandvik +1
We propose an electronic model for the recently discovered hole doped compound . From a multiband Hamiltonian with oxygen and nickel orbitals, a one…
Predictions for Neutron Scattering and Photoemission Experiments on CuGeO_3
Stephan Haas, Elbio Dagotto
Applying numerical techniques to a model recently proposed for the one dimensional spin-Peierls compound CuGeO_3, we calculate dynamical properties that can be directly compared wi…
Study of ARPES data and d-wave superconductivity using electronic models in two dimensions
A. Moreo, A. Nazarenko, S. Haas +2
We review the results of an extensive investigation of photoemission spectral weight using electronic models for the high-Tc superconductors. Here we show that some recently report…
Photoemission spectra of : a theoretical analysis
A. Nazarenko, K. J. E. Vos, S. Haas +2
Recent angle resolved photoemission (ARPES) results for the insulating cuprate have provided the first experimental data which can be directly compared to…
Quasiparticle dispersion of the t-J and Hubbard models
A. Moreo, S. Haas, A. Sandvik +1
The spectral weight of the two dimensional and Hubbard models has been calculated using exact diagonalization and quantum Monte Carlo techniques, a…
Shadow Bands in the Cuprates
Stephan Haas, Adriana Moreo, Elbio Dagotto
A consequence of strong antiferromagnetic correlations in models of high-Tc cuprates is the appearance in photoemission (PES) calculations of considerable more weight above the Fer…
On the Liaison Between Superconductivity and Phase Separation
Stephan Haas, Elbio Dagotto, Alexander Nazarenko +1
Models of strongly correlated electrons that tend to phase separate are studied including a long-range 1/r repulsive interaction. It is observed that charge-density-wave states bec…