Magnetic phase transitions inEuNi5P3: Unusual steps in the magnetization with field

Abstract
Magnetization measurements on single crystals EuNi5 P3 show that it is an antiferromagnet below 0.5 T and 7.5 K. Above 0.5 T and below 7.5 K, there are a series of steps in the magnetization isotherms until saturation is reached. Hysteresis with both field and temperature is observed, as well as a large time dependence of the magnetization at fields near the first step.