Unusual magnetic ordering in RTi₂Ga₄ (R = Ho, Er and Dy) system

Abstract

In this paper we report the magnetic ordering in RTi₂Ga₄ system for the first time. The nature of the magnetic ordering is investigated by susceptibility (ac and dc), resistivity measurements on these samples. The susceptibility of all the compounds show a Curie-Weiss temperature dependence above 150 K with ferromagnetic Curie temperature. However, their low field ac susceptibility data show a large antiferromagnetic transition which splits into two peaks under the application of dc magnetic field. Nevertheless, the dc susceptibility of two of the samples DyTi₂Ga₄ and ErTi₂Ga₄ shows ferromagnetic ordering at a field of 4 kOe. The resistivity and magnetoresistivity also show anomalous behaviour at low temperatures.