Dynamic Magnetic Properties of Two-Dimensional (2d) Classical Square Heisenberg Lattices
Langue
en
Communication dans un congrès avec actes
Ce document a été publié dans
2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2014-05-22, Bran. 2014p. 17-26
Résumé en anglais
We start this article by recalling the main exact results previously obtained for describing the static magnetic properties of 2d square lattices composed of classical spins isotropically coupled between first-nearest ...Lire la suite >
We start this article by recalling the main exact results previously obtained for describing the static magnetic properties of 2d square lattices composed of classical spins isotropically coupled between first-nearest neighbors (i.e., showing Heisenberg couplings) [4c]. Near the critical temperature TC = 0 K we give criterions allowing to directly determine the magnetic phases characterizing 2d magnetic compounds described by our microscopic model. We show that there are three distinct regimes: The Renormalized Classical Regime (RCR), the Quantum Disordered Regime (QDR) and the Quantum Critical Regime (QCR). The static properties give a good image of the spin arrangement and thus remain a good starting point for the study of dynamic properties. As a result, inside each of the three regimes, we may derive the corresponding dynamic behaviors. For practical reasons that we shall detail, we restrict our study to the RCR and QCR cases. An experimental test is given for illustrating this theoretical work. We notably show that it allows one to derive the static correlation length which is an important tool for understanding both static and dynamic properties.< Réduire
Mots clés en anglais
Correlation
Lattices
Silicon
Magnetic properties
Temperature
Magnetic resonance imaging
Couplings
Origine
Importé de halUnités de recherche