Magnetism of CePt2Sn2

Abstract CePt 2 Sn 2 has the tetragonal P4/nmm structure. Polycrystalline (pcr) material possesses in addition a small mono-clinic distortion and shows a magnetic transition below 1 K, while no such transition is seen in purely tetragonal single-crystalline (scr) samples. Our μSR, specific heat and magnetization data are consistent with a spin-glass-like (sgl) state below 0.45 K in scr and long-range order (lro) below 0.85 K in pcr samples. μSR demonstrates clearly that the Ce 3+ spin ensemble remains dynamic down to lowest temperatures (0.02 K) in the sgl state, but reaches the usual quasi–static limit in the lro state. These results are discussed in terms of geometrical magnetic frustration.