Abstract
We have studied the effect of magnetic fields up to 4.5 T on the ground-state structure inEr2Ni2Pb using powder neutron diffraction measurements at low temperatures. The zero-field magneticstate that itself is not uniform and consists of different magnetic phases is rather unstableagainst the magnetic field. As the field is increased, the magnetic reflections of the zero-fieldstructure disappear and a new magnetic phase with commensurate propagation vector isclearly observed in a field of 0.5 T. At higher fields a ferromagnetic state is established inEr2Ni2Pb, which can be fully described only by a model that combines at least twoirreducible representations. The refined Er magnetic moment magnitude of9.10 ± 0.07 µB is very closeto the Er3+ freeion value of 9.0 µB.
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