Search

Investigations made by susceptibility measurements and neutron diffraction experiments on the TbTi0.85Mo0.15Ge compound are reported. This compound crystallizes in the tetragonal structure of the CeScSi-type (space group, 14/mmm.). It exhibits two ferromagnetic transitions at TC1= 280(3) K and TC2 = 75(3) K. Below the first magnetic transition, the magnetization value and coercive field are 2.6 μB and 0.1 T, respectively, at 120 K. The magnetic structure consists of Tb ferromagnetic (001) layers (μTb=8.01(9) μB at 120 K). Below the second magnetic transition, the maximum magnetization is not reached and the coercive field is 1 T at 5 K. The magnetic structure consists of Tb ferromagnetic layers ferromagneticaly coupled along the c axis with the sequence (0, Mx, Mz)–(0, Mx, Mz)–(Mx, 0, Mz)–(Mx, 0. Mz) and at 1.5 K, Mx=1.15(8) μB, M=9.34(13) μB, M=9.41(13) μB (Mx is the projection of the magnetic moment on the XY plane, Mz the projection of the magnetic moment on the c axis). In this compound, no local moment was detected on the (Ti0.85Mo0.15) site.

Investigations made by neutron diffraction experiments on the TbTiSi compound are reported. This compound crystallizes in the tetragonal structure of the CeFeSi-type (space group, P 4/ nmm , No. 129). It has an antiferromagnetic transition in the temperature range 180–300 K. The magnetic structure consists of Tb ferromagnetic (001) layers antiferromagnetically coupled along the c axis in the sequence. (0, 0, M z )–(0, 0, M z )–(0, 0, − M z )–(0, 0, − M z ) in the temperature range 2–180 K and at 2 K, M z =8.70(6) μ B . In this compound, no local moment was detected on the Ti site.