Abstract
In order to understand the nature of magnetic transitions in intermetallic TbNi 5 compound, we have performed high resolution powder and single crystal neutron diffraction studies. Powder diffraction patterns can be described by a superposition of a ferromagnet ( k 1 = 0 ) and a transverse spin wave ( k 2 ≈ 2 π / c (0, 0, 0.018)). The single crystal experiments reveal two spontaneous magnetic transitions: one is a second-order transition at 24 K from a paramagnetic state to an incommensurate structure and another a first-order transition at 10 K from the incommensurate structure to a lock-in structure. At the low-temperature transition a large ( ∼ 15 K ) thermal hysteresis is observed in the temperature dependence of the intensity of magnetic peaks. External magnetic fields destroy the modulated structure and induce a ferromagnetic state, which remains stable even after magnetic fields are switched off.
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