Study of the Crystal Field and Exchange Interactions in Single Crystal Hydride HoFe_(11)TiH

摘要

The influence of the hydrogen absorption upon structural and magnetic properties of single crystals HoFe_(11)Ti have been studied. It was observed that the hydrogenation leads to a crystal lattice expansion of the compounds without change of a tetragonal structure of the ThMn_(12) - type. Magnetization measurement along the main symmetry direction of the tetragonal structure have been performed on RFe_(11)TiH_x (x = 0, 1) single crystals at applied high magnetic fields up to 80 kOe in temperature range from 4.2K to 300K. Torque measurements were carried out in the temperature range 78-700 K in magnetic fields up to 13 kOe. The analysis of the temperature dependence of torque curves allowed to investigate spin reorientation transitions in RFe_(11)TiH_x single crystals. A set of CEF parameters and mean exchange field has been obtained for HoFe_(11)TiH single crystal.