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Compositional Dependence of Electronic Specific Heat in AlCuCo Decagonal Quasicrystals: Evidence for the Hume--Rothery Mechanism of Phase Formation |
| FAN Zhen-Jun;JING Xiu-Nian;ZHANG Dian-Lin |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,
Beijing 100080 |
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| Cite this article: |
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FAN Zhen-Jun, JING Xiu-Nian, ZHANG Dian-Lin 2005 Chin. Phys. Lett. 22 1753-1756 |
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Abstract There is no consensus whether the electron density of states of decagonal quasicrystals has a pseudogap at the Fermi energy similar to that of the icosahedron phase. We answer this question by measuring the electronic specific heat coefficient of AlCuCo decagonal single-quasicrystals over a wide range of composition. While the average valence electron number per atom, e/a, for all the resultant samples changes only within 1.5%, from ～1.92 to less than 1.95. The specific heat coefficient decreases by 15% with the increasing e/a. The large change and the negative slope give strong evidence for Hume--Rothery mechanism of the decagonal phase.
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| Keywords:
65.40.Ba
71.23.Ft
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Published: 01 July 2005
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