Dynamic Properties of Al-Ni-Co Decagonal Quasicrystals Modelled by Ab initio Interatomic Pair Potentials(Condensed matter: structure and mechanical and thermal properties)
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概要
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Vibrational spectra of realistic structural models for ternary Al-Ni-Co decagonal quasicrystals are studied. A bunch of dispersion-less modes is obtained above a few meV, which is extremely low in comparison with usual optic modes. Analyzing the local vibrational density of states at an individual atomic site, we identify several Al sites where low- and high-frequency vibrations are localized. The localized vibrations are attributed to the strong Al-TM interaction and the local atomic arrangements realized in the complex structures. Low-frequency dispersion-less modes are of special interest in relation to the phason degrees of freedom in QC but no signature of large atomic motion causing the phasonic tile flip is obtained in the low-frequency localized vibrational modes.
- 社団法人日本物理学会の論文
- 2007-03-15
著者
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Ishii Yasushi
Department Of Physics Chuo University : Sorst Japan Science And Technology Agency
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HIRAMATSU Seiji
Department of Physics, Chuo University
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Ishii Yasushi
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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Hiramatsu Seiji
Department Of Physics Chuo University
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