Magnetic properties of Mn-doped Bi2Te3 and Sb2Te3

We have fabricated Mn-doped Bi2Te3 and Sb2Te3 single crystals by the vertical gradient solidification method. The compositions and crystal structures of Bi2-xMnxTe3 and Sb2-xMnxTe3 were determined using Electron Probe Micro-Analyzer (EPMA) and powder X-ray diffraction (XRD) patterns, respectively. Both crystal structures were rhombohedral with smaller lattice constants because of the smaller atomic radius of Mn than those of Bi and Sb. Based on the magnetization measurements, Mn-doped Bi2Te3 and Sb2Te3 compounds have ferromagnetic ordering at T-C = 10 and 17 K, respectively. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.