16 citations · 39 across the 7 of their papers we have counts for
7 papers
Supercurrent induced domain wall motion
P. D. Sacramento, L. C. Fernandes Silva, G. S. Nunes +2
We study the dynamics of a magnetic domain wall, inserted in, or juxtaposed to, a conventional superconductor, via the passage of a spin polarized current through a FSF junction. S…
Non-equilibrium properties of the S=1/2 Heisenberg model in a time-dependent magnetic field
V. Turkowski, V. R. Vieira, P. D. Sacramento
The time-dependent behavior of the Heisenberg model in contact with a phonon heat bath and in an external time-dependent magnetic field is studied by means of a path integral appro…
Spin dynamics of the S=1/2 antiferromagnetic zig-zag ladder with anisotropy
P. D. Sacramento, V. R. Vieira
We use exact diagonalization and the modified Lanczos method to study the finite energy and finite momentum spectral weight of the longitudinal and transverse spin excitations of t…
Superconductivity in the SU(N) Anderson Lattice at U=\infty
M. A. N. Araujo, N. M. R. Peres, P. D. Sacramento +1
We present a mean-field study of superconductivity in a generalized N-channel cubic Anderson lattice at U=\infty taking into account the effect of a nearest-neighbor attraction J.…
Spin-density Wave in Ising-coupled Antiferromagnetic Chains
J. P. Rodriguez, P. D. Sacramento, V. R. Vieira
The effect of anisotropy in the nearest-neighbor spin interactions that couple consecutive spin-1/2 antiferromagnetic chains is studied theoretically by considering the l…
Haldane gap in a S=1 exchange model with long-range interactions
P. D. Sacramento, V. R. Vieira
The ground-state properties of the S=1 Haldane-Shastry model are studied using a modified Lanczos algorithm and diagonalizing exactly small chains. We find evidence that, as for th…
Gapless spectrum in a class of S=1 exchange models with long-range interactions
P. D. Sacramento, V. R. Vieira
We present evidence for the absence of a gap in a class of S=1 antiferromagnetic exchange models. The spin exchange is long-ranged of the type where .…