Magnetic properties of ferromagnetic Pu2Pt3Si5

Abstract The structural, magnetic, and thermodynamic properties of a new plutonium based compound, Pu 2 Pt 3 Si 5 , are reported. Single crystals produced by a Sn-flux technique have been analyzed showing a ferromagnetic behavior at 58 K. Pu 2 Pt 3 Si 5 crystallizes in the U 2 Co 3 Si 5 -type orthorhombic Iabm structure (s.g. 72) with atomic parameters a  = 9.9226(2) A, b  = 11.4436(2) A and c  = 6.0148(1) A. The effective ( μ eff ∼0.74 μ B /Pu) and saturated ( σ sat ∼0.34 μ B /Pu) moments as well as the Sommerfeld coefficient ( γ e ∼2 mJ mol −1  K −2 /Pu) could point towards 5f localization in this material.