Magnetic structure of TbAgCu4

Abstract
The magnetic susceptibility of TbAgCu4 has been measured between 4.2 and 400 K. The results are TN=11.5±0.5 K, θp=9 K, and μeff=10.3 μB. Neutron diffraction experiments were performed on polycrystalline specimen at temperatures 4.2–20, 77, and 300 K. The magnetic spin structure was determined to be like that of FeO: the magnetic spins align ferromagnetically in sheets parallel to the (111) plane and couple antiferromagnetically with adjacent sheets. The magnetic spin axis is directed along [111]. The magnetic moment for Tb is obtained to be 9±0.4 μB.