Possibility of a new universality class: The anisotropic Heisenberg model with dipolar interactions
This paper has been withdrawn by the authors due to a possible inconsistency in the program code.
cond-mat.stat-mech↗
arXiv subjects
L. A. S. Mól
Publications and source records attributed to L. A. S. Mól.
On Phase Transition and Vortex Stability in the Generalized XY Models
We study a recent generalization proposed for the XY model in two and three dimensions. Using both, the continuum limit and discrete lattice, we obtained the vortex configuration and shown that out-of-plane vortex solutions are deeply jeopardized whenever the parameter of generalization, $L$, is increased. The critical temperature for such models is calculated using the self consistent harmonic approximation. In both, two- and three-dimensional cases, such a temperature decreases with raising $L$. Our results are also compared with other approximated methods available in the literature.
cond-mat.str-el↗
Oscillating Solitons Pinned to a Nonmagnetic Impurity in Layered Antiferromagnets
We argue that an oscillatory motion of impurity-pinned solitons may occur in layered antiferromagnetic compounds. The characteristic frequencies of these modes, that may be detected by resonance or inelastic neutron scattering, are estimated analytically and depend on the soliton sizes and types .
cond-mat.str-el↗
Monte Carlo study of the critical temperature for the planar rotator model with nonmagnetic impurities
We performed Monte Carlo simulations to calculate the Berezinskii-Kosterlitz-Thouless (BKT) temperature $T_{BKT}$ for the two-dimensional planar rotator model in the presence of nonmagnetic impurity concentration $(ρ)$. As expected, our calculation shows that the BKT temperature decreases as the spin vacancies increase. There is a critical dilution $ρ_c \approx 0.3$ at which $T_{BKT} =0$. The effective interaction between a vortex-antivortex pair and a static nonmagnetic impurity is studied analytically. A simple phenomenological argument based on the pair-impurity interaction is proposed to justify the simulations.
cond-mat↗
Vortices in the presence of a nonmagnetic atom impurity in 2D XY ferromagnets
Using a model of nonmagnetic impurity potential, we have examined the behavior of planar vortex solutions in the classical two-dimensional XY ferromagnets in the presence of a spin vacancy localized out of the vortex core. Our results show that a spinless atom impurity gives rise to an effective potential that repels the vortex structure.
cond-mat.str-el↗