Phonon dispersion relation of aluminum-copper with the Guinier-Preston zone formation |
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| Authors: | N. Kunitomi H. Shiraishi Y. Tsunoda K. Osamura |
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| Affiliation: | Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka, 560, Japan;Department of Metallurgy, Faculty of Engineering, Kyoto University, Sakyoku, Kyoto, 606 Japan |
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| Abstract: | The phonon dispersion relation of ζ00 T branch of Al-1.8 at.% Cu has been measured by means of neutron inelastic scattering. A single crystal specimen aged at room temperature between 17 and 72 hr. after quenching from 550°C shows a strong resonance mode at the energy of about 2.5 THz. This resonance mode cannot be explained by the calculation based on the simple mass-defect model, and may be attributed to the formation of the Guinier- Preston zone. |
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