Influence of Electron Doping on Magnetic Order in CeRu2Al10

Abstract

The effect of electron doping by the substitution of Rh for Ru on unconventional magnetic order in CeRu2Al10 was investigated via neutron powder diffraction. In Ce(Ru1¹xRhx)2Al10 with x = 0.05, 0.12, and 0.2, reorientation of the ordered moment from the c-axis as in pure CeRu2Al10 to the a-axis takes place in all samples, while the ordering vector q ¼ ð0; 1; 0Þ remains unchanged within this concentration range. The moment reorientation is accompanied by an increase in its size by a factor of ³2.4, from ® = 0.43®B at x = 0 to ® = 1.06, 1.04, and 1.02®B for x = 0.05, 0.12, and 0.2, respectively. The continuous decrease in the Néel temperature T0(TN), despite an abrupt increase in ®, underlines the strong anisotropy in the exchange interaction in CeRu2Al10 and the fact that this anisotropy is easily suppressed by electron doping. 1.