Electronic structure and magnetism of ferromagnetic GdTiSi and GdTiGe

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Abstract
Crystal structure and temperature dependence of magnetic susceptibility and electrical resistivity have been determined for GdTiSi and GdTiGe. Both compounds order ferromagnetically and for GdTiGe TC is 374 K which is a very high value for such kinds of compounds. The electronic structure for both compounds has been investigated by photoelectron spectroscopy and compared with calculations performed using the TB-LMTO method. A very good agreement with experiment was obtained, especially for GdTiGe. A strong hybrydization between the d states from Gd and Ti was found and a significant polarization of the Ti 3d electrons in GdTiGe was obtained which may be related to the enhanced indirect exchange between Gd magnetic moments.