Magnetic properties of R2Re2Si2C (R = Tb and Dy)

We have investigated physical properties of R2Re2Si2C (R = Tb and Dy) using magnetic and heat capacity measurements. The two compounds order antiferro magnetically with T-N similar to 17 and similar to 12 K for Tb2Re2Si2C and Dy2Re2Si2C, respectively. The magnetic properties are strongly influenced b y crystal field effects. In both the compounds, below T-N, magnetic suscept ibility measured at 0.4 T and magnetization measured as a function of field at 1.8 and 10.5 K indicate another magnetic transition at low temperatures . The low-temperature phase of both compounds remains antiferromagnetic. In Tb2Re2Si2C a ferromagnetic component appears. However, in the low-temperat ure phase Dy2Re2Si2C has a compensated antiferromagnetic structure. (C) 200 1 Elsevier Science B.V. All rights reserved.