The local vibrational densities of states (VDOS) G(E) of Fe in icosahedral quasicrystal i-Al62Cu25.5Fe12.5 and tetragonal crystal ω-Al70Cu20Fe10 were measured at room temperature by using the 57Fe nuclear resonant scattering of synchrotron radiation. We found a single-band structure at about 28 meV in both the Fe-partial G(E) for i-Al62Cu25.5Fe12.5 and ω-Al70Cu20Fe10. The single-band of i-Al62Cu25.5Fe12.5 quasicrystal is broader than that of the ω-Al70Cu20Fe10 crystal. It contrasts with a strongly structured VDOS expected on theoretical grounds for the icosahedral quasicrystal. The VDOS are discussed in comparison with those obtained by inelastic cold neutron scattering.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry