Magnetic phase diagram of UNiGa
UNiGa is one of the UTX compounds characterised by a hexagonal ZrNiAl type structure. The aim of this study was to clarify the origin of its complex magnetic behaviour. It was found that UNiGa becomes magnetically ordered below 39 K, and strong uniaxial magnetic isotropy exists not only in that region but also in the paramagnetic range. The development of magnetic structure at low temperatures is shown in a schematic magnetic phase diagram. All magnetically ordered phases are collinear and characterised by various stacking of ferromagnetically coupled basal plane layers. Four magnetic phase transitions are found at 34.8, 36.1, 37.5 and 38.8 K in zero field. The three AF phases above 34 K are only stable in very low magnetic fields. Below 34 K there is only one antiferromagnetic phase; the low temperature transition between this and the ferromagnetic phase, shows pronounced hysteresis which decays with increasing temperature. In the paramagnetic region, indications of short-range AF ordering or AF spin fluctuations are observed.
Bibliographic Reference: Paper presented: 22 Journées des Actinides, Méribel (FR), April 22-25, 1992
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Record Number: 199210976 / Last updated on: 1994-12-02
Original language: en
Available languages: en