  We report the crystal growth and characterization of a rare-earth-containing
material, Dy3.00(1)Pt2Sb4.48(2). This compound possesses a similar structure to
the previously reported Y3Pt4Ge6, but lacks two layers of Pt atoms.
Crystallographic disorder was found in Dy3.00(1)Pt2Sb4.48(2). Additionally, the
Dy-Dy framework was found to have both square net and triangular lattices.
Dy3.00(1)Pt2Sb4.48(2)8 was determined to be antiferromagnetically ordered
around ~15 K while a competing antiferromagnetic sublattice also exists at
lower temperature. Strong magnetic anisotropy was observed and several
metamagnetic transitions were seen in the hysteresis loops. Furthermore, the
Curie-Weiss fitting revealed unusually small effective moment of Dy, which is
far below the expected value of Dy3+ (10.65 muB). This material might provide a
new platform to study the relation between crystallographic disorder and
magnetism.
