Artículos de revistas
Crystal field effects in the intermetallic RNi3Ga9 (R=Tb, Dy, Ho, and Er) compounds
Fecha
2017-04Registro en:
Silva, L.S.; Mercena, S.G.; Garcia, Daniel Julio; Bittar, E. M.; Jesus, C. B. R.; et al.; Crystal field effects in the intermetallic RNi3Ga9 (R=Tb, Dy, Ho, and Er) compounds; American Physical Society; Physical Review B; 95; 13; 4-2017; 134434-134434
2469-9969
CONICET Digital
CONICET
Autor
Silva, L.S.
Mercena, S.G.
Garcia, Daniel Julio
Bittar, E. M.
Jesus, C. B. R.
Pagliuso, P. G.
Lora Serrano, R.
Meneses, C.T.
Duque, J.G.S.
Resumen
In this paper, we report temperature-dependent magnetic susceptibility, electrical resistivity, and heat-capacity experiments in the family of intermetallic compounds RNi3Ga9 (R = Tb, Dy, Ho, and Er). Single-crystalline samples were grown using Ga self-flux method. These materials crystallize in a trigonal ErNi3Al9-type structure with space group R32. They all order antiferromagnetically with TN<20K. The anisotropic magnetic susceptibility presents large values of the ratio χeasy/χhard indicating strong crystalline electric-field (CEF) effects. The evolution of the crystal-field scheme for each R was analyzed in detail by using a spin model including anisotropic nearest-neighbor Ruderman-Kittel-Kasuya-Yosida interaction and the trigonal CEF Hamiltonian. Our analysis allows one to understand the distinct direction of the ordered moments along the series - the Tb-, Dy-, and Ho-based compounds have the ordered magnetic moments in the easy ab plane and the Er sample magnetization easy axis is along the ĉ direction.