日時: | 平成24年5月24日(木) 16:00〜 |
Date and time: | 24th May (Thu.) 16:00〜 |
場所: | SPring-8, 萌光館 |
Place: | SPring-8, "HOUKOUKAN" seminar room |
Title: | Novel order and spin liquid in two-dimensional frustrated Heisenberg antiferromagnets |
講演者: | 川村光 氏(大阪大学) |
Speaker: | Prof. Hikaru Kawamura (Osaka University) |
Abstract: |
Ordering of geometrically frustrated magnets has attracted much recent interest, since it often leads to intriguing phenomena like a spin-liquid behavior and an unconventional magnetic ordering. In this talk, I wish to take up two such examples from the ordering of frustrated antiferromagnetic Heisenberg model in two dimensions. One is an exotic vortex order and a "spin-gel" state realized in the antiferromagnetic Heisenberg model on the two-dimensional triangular lattice, which might have some relevance to the transition-like behavior recently observed in certain triangular-lattice antiferromagnets, and the other is a novel first-order transition and topological excitations realized in the antiferromagnetic Heisenberg model on a distorted kagome lattice, which might have some relevance to recent experiments on certain kagome-lattice antiferromagnets.