FINITE-TEMPERATURE ELASTICITY PHASE-TRANSITION IN DECAGONAL QUASI-CRYSTALS
FINITE-TEMPERATURE ELASTICITY PHASE-TRANSITION IN DECAGONAL QUASI-CRYSTALS
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DOI：
10.1103/physrevb.48.9394
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发表时间：
1993-10-01
影响因子：
3.7
通讯作者：
STEINHARDT, PJ
中科院分区：
文献类型：
--
作者：
JEONG, HC;STEINHARDT, PJ
我们提出了准晶体相弹性的有限温度相变的证据。通过一系列的蒙特卡罗模拟研究了能量稳定的十方准晶体的平铺模型。模型的哈密顿量（能量学）由三维单元胞间的最近邻类彭罗斯匹配规则给出。介绍了一种新的序参量和诊断方法。我们证明了在有限温度下从锁相动力学到非锁相动力学的转变发生。在未锁定相中，尽管准晶体在低温下能量稳定，但相子可以被热力学激发。
We present evidence for a finite-temperature phase transition in the phason elasticity of quasicrystals. A tiling model for energetically stabilized decagonal quasicrystals has been studied in an extensive series of Monte Carlo simulations. The Hamiltonian (energetics) of the model is given by nearest-neighbor Penrose-like matching rules between three-dimensional unit cells. A new order parameter and diagnostics have been introduced. We show that a transition from locked-phason to unlocked-phason dynamics occurs at finite temperature. In the unlocked phase, phasons can be thermodynamically excited even though the quasicrystal is energetically stabilized at low temperatures.