Magnetic and Electrical Properties of a Single-Grained Al_<70>Pd_<21>Mn_9 Icosahedral Quasicrystal

概要

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The magnetization of a stable single-grained Al_<70>Pd_<21>Mn_9 icosahedral quasicrystal has been investigated in the temperature region between 2 and 600 K below the magnetic field 80 kOe. The susceptibility yields a Curie constant 1.75×10^<-4> cgsemu・K/g, a Curie temperature -1.62 K, and a constant susceptibility contribution -0.25×10^<-8> cgsemu/g. Magnetization curves at low temperatures suggest that only about 1% of the Mn atoms are magnetic. The temperature dependence of the susceptibility above 300 K shows a positive T^2 contribution, which has been first observed in magnetic quasicrystals and is considered to originiate from a pseudogap in the electronic density of states at E_F causing the stability. Temperature- and magnetic-field-dependencies of the electrical conductivity are well accounted for by a weak localization theory including spin and spin-orbit scattering. The agreement between the experimental data and the fitting is not improved by adding the diffusion channel contribution of electron-electron interaction effects.
社団法人日本物理学会の論文
1994-05-15