Metamagnetic states in single crystal HoNi2B2C at T 1.9 K: Torque magnetometry study
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Metamagnetic transitions in single-crystal rare-earth nickel borocarbide HoNi2B2C have been studied at T 1.9 K with a Quantum Design torque magnetometer. With increasing field, transitions to antiferromagnetic, ferrimagnetic, non-collinear, and saturated paramagnetic states take place. The critical fields of the transitions depend crucially on the angle between applied field and the easy axis [110]. Measurements of torque along the c axis have been made while changing the angular direction of the magnetic field (parallel to basal tetragonal ab planes) and with changing field at fixed angle over a wide angular range. Two new phase boundaries in the region of the non-collinear phase have been observed, and the direction of the magnetization in this phase has been precisely determined. At low field the antiferromagnetic phase is observed to be multidomain. In the angular range around the hard axis (-6 6, where is the angle between the field and hard axis [100]) the magnetic behavior is found to be "frustrated" with a mixture of phases with different directions of the magnetization. Allerton Press, Inc. 2008.
