Low temperature magnetic order of the new ternary rare earth compounds (RRub 4) with the YCrB 4-type structure

Abstract

Low temperature magnetic susceptibility and electrical resistivity measurements have been carried out for the ternary rare earth ruthenium borides RRuB 4 (R ≡ Gd, Tb, Dy, Ho, Er, Tm, Lu and Y) with the orthorhombic YCrB 4-type structure. Ferromagnetic order was observed for all magnetic compounds except R ≡ Tm, where no transition was observed above 2 K. For the non-magnetic compound YRuB 4 the superconducting transition at 1.4 K was confirmed with the onset of 1.36 K in the present study.