Synthesis and properties of LnRu2P2 (Ln = lanthanides) crystals

Abstract Crystals of ternary LnRu 2 P 2 (Ln = Pr, Nd, Sm, Tb, Dy, Er) systems were synthesized, and their crystallographic, magnetic, and electric properties were investigated. All the crystals have a tetragonal ThCr 2 Si 2 -type structure of space group I 4/ mmm . The lattice constants decrease as the number of 4f electrons increases, reflecting the lanthanide contraction. An antiferromagnetic transition was observed for LnRu 2 P 2 (Ln = Pr, Nd, Sm, Tb, Dy) at 25 K (Pr), 19 K (Nd), 15 K (Sm), 22.5 K (Tb), and 13 K (Dy). However, no transition was observed for ErRu 2 P 2 down to 5 K. The P eff agrees well with the theoretical moment g J ( J + 1 ) of lanthanides, suggesting that lanthanides make a major contribution to the magnetic moment of LnRu 2 P 2 . A spin-flop-like transition was observed in the M ( H ) curves of PrRu 2 P 2 and TbRu 2 P 2 at 4 and 8 kOe, respectively; however, no saturation was observed up to 55 kOe.