Anomalous Magnetization Process of Two-Dimensional Frustrated Quantum Antiferromagnets
Mardi 26 juillet 2016 14:00
- Duree : 1 heure
Lieu : Science Building - Room 213, 2nd floor - ESRF - 71 avenue des Martyrs - Grenoble
Orateur : Toru SAKAI (Huogo University & Spring-8)
We study the magnetization process of the spin-1/2 Heisenberg antiferromagnet on a distorted square-kagome lattice and related lattices by the numerical-diagonalization method. The magnetization jump at one-third of the height of the saturation is examined in detail ; we find that the jump becomes larger when a small distortion is switched on and that it is accompanied by an abrupt change in lines along microscopic spin directions. Our finite-size results successfully confirm that the magnetization jump in a spin-isotropic system is a
macroscopic jump that survives in the thermodynamic limit and that the changes in spin directions are common to a spin-flop phenomenon observed in spin-anisotropic systems. The magnetization processes
of the spin-1/2 kagome and triangular lattice antiferromagnets are also discussed.
Contact : taffut@ill.fr
Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Site de l'évènement : Polygone scientifique
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