Local Magnetic Moment in Al-Mn Based Quasicrystals

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Abstract
Mössbauer spectra and magnetic susceptibility have been measured for Al-Mn based quasicrystals containing Fe. The separations of outer peaks of the Mössbauer spectra at 4.2 K with external magnetic fields of 3.0 and 4.5 T correspond to the ones due only to the applied field, indicating that the Fe atoms have substantially no local magnetic moment. The magnetic susceptibilities for quasicrystalline Al 72 Si 6 (Mn 1- x Fe x ) 22 with x =0, 0.01 and 0.25 obey the Curie-Weiss law, giving approximately the same effective moment per atom of transition elements, int spite of the substitution of non-magnetic Fe for Mn. The above facts is, in turn, interpreted by either the fact that (1) there are magnetic and non-magnetic Mn sites and Fe atoms occupy preferentially the latter sites, or that (2) the itinerant electrorns are responsible for the temperature-dependent susceptibility.