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18 papers · 1 filter
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…
Effects of intrabilayer coupling on the magnetic properties of YBaCuO
A. W. Sandvik, D. J. Scalapino
A two-layer Heisenberg antiferromagnet is studied as a model of the bilayer cuprate YBaCuO. Quantum Monte Carlo results are presented for the temperature dependence of…
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…
Excitonic Phase Transition in Electronic Systems
M. A. Continentino, G. M. Japiassu, A. Troper
Although predicted theoretically excitonic phase transitions have never been observed. Recently it has been claimed that they can occur in some strongly correlated materials. We st…
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…
A Possible Phononic Mechanism for -Superconductivity in the Presence of Short-Range AF Correlations
Alexander Nazarenko, Elbio Dagotto
We discuss the high temperature superconductors in a regime where the antiferromagnetic (AF) correlation length is only a couple of lattice spacings. In the model proposed here, th…