arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.3812cond-mat.stat-mech
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一个受挫Potts模型中的偏序

Partial order in a frustrated Potts model

Ryo Igarashi, Masao Ogata

摘要:

利用Wang-Landau蒙特卡罗模拟研究了一个三维金刚石晶格上具有特殊几何阻挫的四态铁磁Potts模型,该模型是由在$β$ -烧绿石氧化物KOs $_2$ O $_6$中发现的一种特殊结构相变激发的.我们发现,该模型经历了非常规的一级相变,在一个二维的六边形片结构的系统中的一半的自旋秩序,而其余的一半保持无序。有序的纸张和无序的纸张一张接一张地堆叠。我们在$T = 0$处得到了相当大的剩余熵,它来源于无序片。

英文摘要:

We investigate a 4-state ferromagnetic Potts model with a special type of geometrical frustration on a three dimensional diamond lattice by means of Wang-Landau Monte Carlo simulation motivated by a peculiar structural phase transition found in $β$-pyrochlore oxide KOs$_2$O$_6$. We find that this model undergoes unconventional first-order phase transition; half of the spins in the system order in a two dimensional hexagonal-sheet-like structure, while the remaining half stay disordered. The ordered sheets and the disordered sheets stack one after another. We obtain a fairly large residual entropy at $T = 0$ which originates from the disordered sheets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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