Magnetic behaviour of UB4 at high temperatures

Abstract UB 4 is a moderate heavy fermion compound which does not exhibit any magnetic order down to 0.3 K. In this work, the magnetic properties of UB 4 are investigated in an extended temperature range, 2–800 K, on high-quality single crystals. A cross-over from a low temperature 5f itinerant behaviour to a high temperature 5f localized behaviour is observed, marked by broad peaks in the magnetic susceptibility measured along the main crystallographic axes.