Magnetic properties of Ta(Fe1-xTx)2 with T=V, Cr, Mn, Co and Ni

The C14 Laves phase TaFe2 is a paramagnet. The magnetic properties and phase diagrams of V, Cr, Mn, Co and Ni substituted systems for Fe in TaFe2 have been investigated using magnetization and NMR measurements. Antiferro- or/and ferromagnetic states appeared by the V, Cr and Mn substitutions. In the Cr and Mn cases ferromagnetic states appeared first (very weak in Cr case) and then the both change to be antiferromagnetic. In the V case only antiferromagnetic state appeared from the beginning of substitution. The susceptibilities of the slightly V-substituted compounds were, however, exchange-enhanced at low temperatures. The above mentioned magnetic changes are qualitatively the same to the previously reported Nb(Fe1-xTx)2 systems. The electronic condition of the appearance of ferro- and antiferromagnetism can systematically be interpreted in both systems.