Magnetic Properties of Intermetallic Compounds in Manganese-Tin System: Mn_3.67Sn, Mn_1.77Sn, and MnSn₂

Abstract

The magnetic properties of Mn 3.67 Sn, Mn 1.77 Sn, and MnSn 2 were investigated. In Mn 3.67 Sn, an anomalous magnetic phenomenon was found, which may be due to its antiferromagnetism. The Néel temperature T N , the effective number of Bohr magnetons per Mn n p , and the asymptotic Curie point θ a are 365°K, 3.58, and -275°K, respectively. Mn 1.77 Sn is ferrimagnetic. The estimated saturation magnetization per Mn at 0°K, n f µ B , as well as n p and the Curie temperature T C , were determined after various heat treatments. With lowering the annealing temperature, T C was increased from 226° to 263°K, and n f was increased from 0.92 to 1.23, while n p stayed nearly constant at about 3.4. These behaviors are interpreted in terms of the effect of atomic ordering. It was also found that MnSn 2 exhibited an antiferromagnetic behavior. T N , θ a , and n p are 324°K, +190°K, and 3.48, respectively.