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19942026
most citedObservation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above eV

409 citations

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Showing 1997 · cond-mat.str-elShow all

5 papers · 2 filters

cond-mat.str-el1997★ 6 cited

Effect of Spin-1 Impurities in Dimerized Heisenberg Chains

P. M. Hansen, J. A. Riera, A. Delia +1

The effects of spin-1 impurities introduced in dimerized antiferromagnetic spin chains are studied using Lanczos diagonalization and quantum Monte Carlo simulations. Firstly, the m…

cond-mat.str-el1997★ 31 cited

Revisiting two holes in a locally antiferromagnetic background: the role of retardation and Coulomb repulsion effects

Jose Riera, Elbio Dagotto

The problem of two holes in the presence of strong antiferromagnetic fluctuations is revisited using computational techniques. Two-dimensional clusters and 2-leg ladders with up to…

cond-mat.str-el1997★ 102 cited

Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities

George Balster Martins, Markus Laukamp, Jose Riera +1

The local enhancement of antiferromagnetic correlations near vacancies observed in a variety of spin systems is analyzed in a single framework. Variational calculations suggest tha…

cond-mat.str-el1997★ 22 cited

Superconductivity and incommensurate spin fluctuations in a generalized t-J model for the cuprates

C. D. Batista, L. O. Manuel, H. A. Ceccatto +1

We consider the slave-fermion Schwinger-boson decomposition of an effective model obtained through a systematic low-energy reduction of the three-band Hubbard Hamiltonian. The mode…

cond-mat.str-el1997★ 40 cited

Hole Doping Evolution of the Quasiparticle Band in Models of Strongly Correlated Electrons for the High-T_c Cuprates

Daniel Duffy, Alexander Nazarenko, Stephan Haas +3

Quantum Monte Carlo (QMC) and Maximum Entropy (ME) techniques are used to study the spectral function of the one band Hubbard model in strong coupling including a ne…