We present the magnetic and calorimetric results obtained on a single ${\mathrm{Al}}_{68.7}$${\mathrm{Pd}}_{21.7}$${\mathrm{Mn}}_{9.6}$ quasicrystal grain. We show that a few Mn’s are really magnetic and carry a large spin. These spins are coupled by Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions yielding a spin-glass transition at 1.1 K. Surprisingly, the RKKY potential is found to equal that of metastable Al-Mn quasicrystals and that of crystalline Cu-Mn. In contrast with the case of melt-spun metastable Al-Mn quasicrystals, the linear T term of the specific heat is very small: about 1/4 of that of Al. Finally, we conclude to the general character and to the intrinsic origin of the magnetism of quasicrystals containing Mn.

• Received 10 January 1995

DOI:https://doi.org/10.1103/PhysRevB.52.886