2A09 XY模型からIsing模型へ : 有限温度

概要

論文の詳細を見る
To clarify the mechanism of the successive phase transitions occurring at ferroelectric and antiferroelectric smectic liquid crystals, the crossover behaviour of the XY model with competing second nearesst neighbour interaction exposed to a two-fold field to the Ising model (ANNNI model) is studied at finite temperature. The phase transition line from an ordered phase with Ising symmetry to the one preserving the property of XY model is shown to lie at the low temperature side of a transition curve between the former and a disordered phase, which leads to the result that the freedom of the XY spin is suppressed at finite temperature more strongly than the case of absolute zero temperamre. The phase with period 6 structure is analysed in detail on behalf of modulated phases with freedom of XY spin.
日本液晶学会の論文
1998-10-12