title: Magnetic properties and electronic structures of R-Ni-B compounds where R is a heavy rare earth.
abstract: Magnetic measurements were performed in the temperature range 4.2-300 K and fields up to 70 kOe on R(3)Ni(7)B(2) compounds with R = Gd, Tb, Dy, Ho, Er. The Curie temperatures decrease from 38.5 K (Gd) to 7 K (Er). Band structure calculations show that nickel, at 0 K, has a very small magnetic polarization, oriented antiparallel to the rare-earth moment. The XPS measurements suggest the presence of unoccupied Ni3d states. The reciprocal susceptibilities follow a Curie-Weiss type behaviour. Effective nickel moments of 1.33 ± 0.25 µ(B) were determined. The magnetic behaviour of nickel is analysed in models which take into account electron correlation effects in d bands.
authors.affiliation: Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
authors.forename: E
authors.initials: E
authors.lastname: Burzo
authors.forename: N
authors.initials: N
authors.lastname: Bucur
authors.forename: L
authors.initials: L
authors.lastname: Chioncel
authors.forename: V
authors.initials: V
authors.lastname: Rednic