Abstract
The UMnxAl12−x system exists in the single-phase form for 3⩽x⩽7. The magnetic properties were examined in the temperature range 4.2–1000 K and under magnetic fields up to 14 T at low temperature (LT). For x > 3 the samples are paramagnetic with θp and μeff equal to −110-0 K and 2.42–4.25 μB respectively, in agreement with previous magnetic and neutron diffraction examinations. For x=3 the magnetic susceptibility shows a sharp maximum at about 30–40 K. The magnetization vs. magnetic field plot at LT shows a linear behaviour below about 2.0 T and then a sudden change in slope, reaching a kind of saturation. The results are discussed in terms of the MnMn separation and possible magnetic structure.
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