Magnetic susceptibility, heat capacity, and neutron diffraction measurements have been carried out in order to study the unusual magnetic ordering of TbNi 5 using a single crystal over the temperature region of 2-30 K. Two spontaneous magnetic transitions have been observed: one is a second-order transition from a paramagnetic state to an incommensurate structure ( T p = 24 K), and the other, a first-order transition from the incommensurate structure to a lock-in phase ( = 10 K). We also found an irreversible magnetic field-induced transition from the modulated structure to the ferromagnetic collinear one.
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