Semi-classical spin dynamics of the antiferromagnetic Heisenberg model on the kagome lattice - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Semi-classical spin dynamics of the antiferromagnetic Heisenberg model on the kagome lattice

Résumé

We investigate the dynamical properties of the classical antiferromagnetic Heisenberg model on the kagome lattice using a combination of Monte Carlo and molecular dynamics simulations. We find that frustration induces a distribution of timescales in the cooperative paramagnetic regime (i.e. far above the onset of coplanarity), as recently reported experimentally in deuterium jarosite. At lower temperature, when the coplanar correlations are well established, we show that the weath- ervane loop fluctuations control the system relaxation : the time distribution observed at higher temperatures splits into two distinct timescales associated with fluctuations in the plane and out of the plane of coplanarity. The temperature and wave vector dependences of these two components are qualitatively consistent with loops diffusing in the entropically dominated free energy landscape. Numerical results are discussed and compared with the $O(N)$ model and recent experiments for both classical and quantum realizations of the kagome magnets.
Fichier principal
Vignette du fichier
1403.7903v1.pdf (6.11 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01367486 , version 1 (16-09-2016)

Identifiants

Citer

Mathieu Taillefumier, Julien Robert, Christopher L. Henley, Roderich Moessner, Benjamin Canals. Semi-classical spin dynamics of the antiferromagnetic Heisenberg model on the kagome lattice. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (6), pp.064419. ⟨10.1103/PhysRevB.90.064419⟩. ⟨hal-01367486⟩
152 Consultations
285 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More