Recently magnetic properties of the R₇Pd₃ intermetallic compounds were examined [1]. For La₇Pd₃ the electrical resistivity exhibits a tendency to saturation at higher temperatures and the superconducting transition at 6 K. Ce₇Pd₃ has an antiferromagnetic transition at 5 K, while Pr₇Pd₃ has such transition at only 1.7 K. Nd₇Pd₃ shows two characteristic temperature: first one 33 K related to ferromagnetic – antiferromagnetic transition and the second 38 K related to transition antiferromagnetic – paramagnetic. Sm₇Pd₃ exhibits two sharp peaks connected with antiferromagnetic – ferrimagnetic transition at 18.4 K and at 167 K connected with transition from ferrimagnetic state to paramagnetic. All measured properties are sensitive to the pressure. Magnetocaloric properties of Gd₇Pd₃ were investigated [2].
Canepa et al. [2] found the ferromagnetic transition for polycrystalline Gd₇Pd₃ at 323 K. This sample crystallized in the hexagonal Th₇Fe₃ type of crystal structure with space group P6₃mc. The addition of the second phase was less than 3%. The refrigerant capacity was estimated as 100 J/kg at applied field 2 T and 380 J/kg at 5 T.
The electrical resistivity, lattice parameters temperature dependences, magnetization, magnetic susceptibility, thermopower and electronic structure were measured for single crystals Gd₇T₃. These compounds exhibit anomalous and anisotropic character. The ordering temperature for Gd₇Pd₃ single crystals is 331 K and is higher than obtained for polycrystalline sample [2]. Recently for polycrystalline sample Gd₇Rh₃ the giant magnetoresistivity was found. The aim of this work is to measure magnetic properties this compound along the principal directions.
1. H. Kadomatsu, K. Kuwano, K. Umeo, Y. Itoh, T. Tokunaga, J. Magn. Magn. Mater. 189 (1998) 335.
2. F. Canepa, M. Napoletano, S. Cirafici, Intermetallics 10 (2002) 731.
3. K. Sengupta, S. Rayaprol, E.V. Sampathkumaran, Europhysics Letters 69 (2005) 454.

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