Phonon-phason coupling in icosahedral quasicrystals
Phonon-phason coupling in icosahedral quasicrystals
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DOI：
10.1209/epl/i1999-00328-9
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发表时间：
1998-12
期刊：
影响因子：
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通讯作者：
Wenjuan Zhu;Wenjuan Zhu;Christopher L. Henley
中科院分区：
文献类型：
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作者：
Wenjuan Zhu;Wenjuan Zhu;Christopher L. Henley
从基于修饰的准晶体结构模型的弛豫模拟中，我们计算了（通常被忽视的）声子-相位耦合常数。在i- almn和i-(Al,Cu)Li合金中，其符号相反；它的大小相对于声子和相子弹性常数的无量纲测量是1/10阶，这表明它的影响很小，但可以检测到。我们还给出了在布拉格峰的漫射尾迹中声子-相位效应何时显著的判据。
From relaxation simulations of decoration-based quasicrystal structure models using microscopically based interatomic pair potentials, we have calculated the (usually neglected) phonon-phason coupling constant. Its sign is opposite for the two alloys studied, i-AlMn and i-(Al,Cu)Li; a dimensionless measure of its magnitude relative to the phonon and phason elastic constants is of order 1/10, suggesting its effects are small but detectable. We also give a criterion for when phonon-phason effects are noticeable in diffuse tails of Bragg peaks.