Magnetic properties of the GdTiSb and GdTiSn - the new intermetallic compounds.
University of Silesia, August Chełkowski Institute of Physics, Department of Solid State Physics, Uniwersytecka 4, Katowice 40-007, Poland
The ternary intermetallic compounds from families of RTSb and RTSn ( R- rare earth, T- transition metal) orders magnetically below a few Kelvin and are antiferromagnets, the ordering temperature is e.g. 3.5 K and 11 K for GdNiSb for GdNiSn, respectively.
The new GdTiSb intermetallic compound possesses the very high ordering temperature reaching the 268 K. It crystallizes in a tetragonal type of structure with lattice parameters a=652 pm and c= 935 pm. The magnetic susceptibility in the paramagnetic region follows the Curie-Weiss law with the effective magnetic moment of 8.1 µB (7.94 for Gd3+). The ferromagnetic transition occurs at 275 K under the magnetic field of 0.01 T. AC susceptibility measurements made in very weak magnetic field verifies it down to 268 K. The tin counterpart compound - GdTiSn orders magnetically below 108 K.
The GdTiSb resistivity at the room temperature is of the value of 110 μΩ*cm and shows a negative curvature in the temperature dependence, what can suggest a strong interaction between the d and the f electrons systems. The main ferromagnetic transition is slightly visible on the resistivity. Paradoxically, the reorientation effect occurring at 30 K emerges as an upturn on the resistivity. The mirror fingerprint of magnetic phenomena is visible in the GdTiSn temperature dependence of resistivity, at about 110 K and 15 K.
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 Y.Adosh et al., J. Magn. Magn. Mater 177-181(1998) 1063-64
Presentation: poster at E-MRS Fall Meeting 2005, Symposium B, by Adam Guzik
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-04-20 09:09 Revised: 2009-06-07 00:44