Low-energy lattice excitations in the decagonal Al-Ni-Fe and icosahedral Al-Cu-Fe quasicrystals and the (Al,Si)-Cu-Fe cubic phase |
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Authors: | G Kh Panova M G Zemlyanov P P Parshin A A Shikov and R A Brand |
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Institution: | (1) Department of Materials Science and Engineering, University of Tokyo, Tokyo, Japan |
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Abstract: | The specific heat of decagonal Al71.3Ni24.0Fe4.7 and icosahedral Al62Cu25.5Fe12.5 quasicrystals and the Al55.0Si7.0Cu25.5Fe12.5 cubic phase approximating the structure of the icosahedral alloy has been studied in the temperature range 4.2–40.0 K. All
the three compounds exhibit low coefficients of the electronic heat capacity and pronounced deviations of the low-temperature
lattice heat capacity from a cubic temperature law in the range 5–10 K. The results obtained by the thermodynamic method and
inelastic neutron scattering have been compared and analyzed. It has been established that, at energies ɛ < 14 meV, the spectral
density of thermal vibrations in the icosahedral quasicrystal is substantially higher than those in the cubic approximant
and in decagonal quasicrystal. |
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