ANISOTROPIC MAGNETISM AND RESISTIVITY OF AN AL70NI15CO15 DECAGONAL QUASI-CRYSTAL
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We report the results of dc magnetization and electrical resistivity studies of a single-domain Al70Ni15Co15decagonal quasicrystal. The temperature dependence and anisotropy of the electrical resistivity are in excellent agreement with previous results for a similar sample. The magnetic properties were determined by superconducting quantum interference device magnetometry over the temperature range 1.8-300 K for magnetic fields between 10 Oe and 10 kOe. The magnetic behavior can be characterized by a weak ferromagnetic component M0(H) which saturates in moderate fields (H1 kOe) and a differential susceptibility, 0=M/H, obtainable from the high-field data. The observed magnetization M=0H+M0is slightly anisotropic and essentially temperature independent below room temperature. For H parallel to the quasicrystal axis, we observe 0=7. 110-7emu/g and M0=2.010-3emu/g. For H perpendicular to the quasicrystal axes, we obtain 0=8.210-7emu/g and M0=1.710-3emu/g. An anisotropic and weak superconducting transition was observed at T=3.2 K, corresponding to a superconducting volume fraction of only 10-3.
