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Abstract: We present the first Raman investigation of icosahedral quasicrystals. Broadstructured bands in the energy range up to ~ 500 $cm^{-1} have been observed ina series of AlFeCu, AlPdMn and AlPdRe systems. Original information on thevibrational density of states gomega was obtained for AlPdRe; for AlFeCu andAlPdMn estimated gomega shows a good agreement with the previous neutronresults, but demonstrates finer structure. Strong increase in the parameter ofelectron-vibrational coupling for the low-energy vibrations and its correlationwith changes in electronic conductivity has been observed in the series fromAlFeCu to AlPdRe. This suggests the increase of the degree of localization forthese vibrational excitations and involved electronic states.



Autor: Yu. S. Ponosov, N. I. Shchegolikhina, A. F. Prekul

Fuente: https://arxiv.org/







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