日本原子力研究開発機構 (JAEA) / 量子ビーム応用研究部門
放射光科学研究ユニット / 放射光量子シミュレーショングループ
|Date and time:||26th May (Mon.) 16:00〜|
|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)|
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.