XY-like Incommensurate Magnetic Order in Ce₂SnS₅

We report the synthesis of single crystals of Ce₂SnS₅ through a two-stage chemical vapor transport method. The Ce₂SnS₅ system is a member of the orthorhombic $Pbam$ (No. 55) space group and realizes a distorted trigonal tricapped prism (TTP) crystal field around each cerium site. We characterized the sample through orientation-dependent magnetization and heat capacity measurements to probe the magnetic anisotropy in the system characteristic of XY-like anisotropic Heisenberg model behavior. Ce₂SnS₅ furthermore enters a zero-field ordered phase under TN = 2.4 K; powder neutron diffraction measurements reveal incommensurate magnetic order near TN. The system locks into a commensurate structure with a (qₓ, qy, qz) = (1/3,0,0) propagation vector below approximately 1.2 K.