第43回 原研・兵県大合同コロキウム

日時: 平成20年5月26日(月) 16:00〜
Date and time: 26th May (Mon.) 16:00〜
場所: SPring-8, 萌光館
Place: SPring-8, "HOUKOUKAN" seminar room
Title: A mechanism of the downturn in inverse susceptibility in triangle-based frustrated spin systems
講演者: 礒田誠 氏 (香川大学)
Speaker: Prof. Makoto Isoda (Kagawa University)
Abstract:

A mechanism for the downturn of inverse magnetic susceptibility below an intermediate temperature, recently observed in many experiments, is proposed as an intrinsic feature of lattices with triangle-based frustrated geometries. The temperature at the bending of the inverse susceptibility curve may be related to the features of other thermodynamic properties; the hump of the specific heat and the emergence of a 1/3 plateau in magnetization under a magnetic field. This fact is derived through a Monte Carlo simulation study of the Ising model on triangular and kagome lattices, and the exact calculation for the single and small-sized triangle clusters, both on the Ising and Heisenberg models. These results may indicate the dominance of S(Sz)=1/2 quantum (classical) trimer formation in the intermediate energy regime in two-dimensional triangle-based lattices.  The association with the recently synthesized ideal kagome system ZnCu3(OH)6Cl2 will be referred.