Magnetic properties of Gd7T3 (T=Rh, Pd) single crystals

Monika Klimczak 2Ewa Talik 2Robert Troć 1Joachim Kusz 2

1. Polish Academy of Sciences, Institute of Low Temperature and Structure Research (INTiBS), Okólna 2, Wrocław 50-422, Poland
2. University of Silesia, Katowice, Poland

Abstract

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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Presentation: poster at E-MRS Fall Meeting 2005, Symposium B, by Monika Klimczak
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-11 08:28
Revised:   2009-06-07 00:44
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