Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnetic Materials II
MA 8.2: Vortrag
Montag, 26. März 2007, 15:30–15:45, H22
GdPdSb as a weak ferromagnet and half metal at low temperature — •Frederick Casper, Hem Kandpal, and Claudia Felser — Institut für Analyt. Chemie und Anorg. Chemie, Johannes Gutenberg Universität Mainz, Staudinger Weg 9, D-55099 Mainz, Germany
REPdSb compounds exhibit a variety of interesting properties, such as Kondo effect, half metallic behaviour and heavy fermion behaviour with magnetic instability [1]. GdPdSb crystallizes in the LiGaGe structure (space group P 63 m c). The self-consistent band structure calculations using the full potential linear augmented plane wave (FLAPW) method [2] confirmed the antiferromagnetic behaviour of this compound with TN = 14K [3].
The antiferromagnetic configuration is more stable compared with the ferromagnetic configuration, but the energy difference is very small between antiferromagnetic and ferromagnetic configuration; therefore one could expect (weak) ferromagnetic behaviour at low temperature. SQUID measurements show a rising of the magnetic susceptibility below TN at 7K. Also a small hysteresis loop is observed. This could be of possible weak ferromagnetic ordering in agreement with the prediction of the calculation. According to band structure calculations, ferromagnetic ordered GdPdSb is half metallic, which is the first half metallic ferromagnet with LiGaGe structure.
This work is supported by DFG via SPP1166