Magnetic Properties of Ternary Gallides of type RNi4Ga (R = Rare earths)

摘要

The magnetic properties of RNi4Ga (R = La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tmand Lu) compounds have been investigated. These compounds form in a hexagonalCaCu5 type structure with a space group P6/mmm. Compounds with the magneticrare earths, R = Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm, undergo a ferromagnetictransition at 5 K, 17 K, 20 K, 19 K, 12 K, 3.5 K, 8 K and 6.5 K, respectively.The transition temperatures are smaller compared to their respective parentcompounds RNi5. PrNi4Ga is paramagnetic down to 2 K. LaNi4Ga and LuNi4Ga arePauli paramagnets. All the compounds show thermomagnetic irreversibility in themagnetically ordered state except GdNi4Ga.