A Compton scattering study on the Hume-Rothery mechanism of AlCu–TM (TM: transition metal) quasicrystals
| Autor: | Ryo Ishikawa, Y. Watanabe, Yoshiharu Sakurai, Yoshihiko Yokoyama, Masayoshi Itou, Nozomu Hiraoka, Junpei Okada, Susumu Nanao |
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| Rok vydání: | 2006 |
| Předmět: |
Condensed Matter::Quantum Gases
Free electron model Condensed matter physics Chemistry Icosahedral symmetry Fermi level Compton scattering Physics::Optics Quasicrystal Electron Condensed Matter Physics Condensed Matter::Materials Science symbols.namesake Physics::Atomic and Molecular Clusters symbols Mathematics::Metric Geometry General Materials Science Pseudogap Fermi Gamma-ray Space Telescope |
| Zdroj: | Journal of Physics: Condensed Matter. 18:7203-7208 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/18/31/015 |
| Popis: | The electron momentum distributions in icosahedral Al64Cu23Fe13, icosahedral Al63Cu23Ru13 and decagonal Al65Cu15Co20 quasicrystals have been studied using the high-resolution Compton scattering technique. The electron-per-atom ratios (e/a) of the quasicrystals were determined quantitatively for the first time from the Compton profiles. The radii of the Fermi spheres were evaluated from the values of e/a on the basis of the free-electron model. Comparisons between the radius of the Fermi spheres and the size of the quasi-Brillouin zones show that the icosahedral quasicrystals meet the empirical matching condition, while the decagonal quasicrystal does not do this so well. This implies that the Hume-Rothery mechanism works for the formation of the pseudogap near the Fermi level in the icosahedral quasicrystals, although it operates only slightly in the decagonal quasicrystal. |
| Databáze: | OpenAIRE |
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