Nuclear Magnetic Resonance Study of the Al-Pd-Mn Quasicrystalline Alloys

The²⁷Al and⁵⁵Mn spin-echo spectra in the Al-Pd-Mn quasicrystalline alloys have been measured as a function of Al content and temperature. The lineshape and peak shift between the simple icosahedral phase and the face-centred icosahedral phase exhibit different characteristics in the²⁷Al and⁵⁵Mn spectra. They are temperature independent in the former phase and markedly temperature dependent in the latter phase. The²⁷Al Knight shift is almost zero in the Al₉₀-_xPd_xMn₁₀-containing simple icosahedral phase with Pd contents x of 5, 10 and 15 whereas that in the Al₇₀Pd₂₀Mn₁₀ is negative, suggesting that these phases are in different electronic states.