Abstract
We report on the low temperature specific heat C p and magnetic measurements for the following Al-Mn alloys: solid solution Al-3at.%Mn, Al 86Mn 14 and Al 75Mn 20Si 5 in quasi-crystalline phases. From the amplitude of the electronic specific heat determined below 0.3 K, we propose, in agreement with the electrical resistivity values, that the large density of states in the quasi-crystalline phases are due to virtual bound states related to a regime of isolated manganese “impurities”. Both C p and magnetic measurements indicate a rapid evolution of the magnetic interactions from Al 86Mn 14 to Al 75Mn 20Si 5. In the latter, the ξ ac data together with the nuclear magnetic hyperfine specific heat confirm a spin glass state similar to that of canonical spin glasses such as Cu-Mn and Au-Mn. We emphasize that a small fraction of Mn s atoms are magnetic sites (probably less than 10%) in both quasi-crystalline phases.
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