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R. Grössinger, M. Schönhart, P. Kerschl, S. Özcan, M. El-Hagary, J. Freudenberger, H. Michor:
"High field investigation on the ferrimagnetic systems GdCo_9-xSi_4+x (-0.2 <= x<= 0.2) and TbCo₉Si₄";
Journal of Physics: Conference Series, 51 (2006), 139 - 142.

High field investigation on the ferrimagnetic systems GdCo_9-xSi_4+x (-0.2 <= x<= 0.2) and TbCo₉Si₄

R Grössinger1, M Schönhart1, P Kerschl2, S Özcan1, M El-Hagary1,3, J Freudenberger2 and H Michor1
1 Institut für Festkörperphysik, T.U.Vienna, Austria
2 IFW Dresden; Germany
3 Physics Department, Qassim University, Buraidah, Kingdom of Saudi Arabia
E-mail: groess@ifp.tuwien.ac.at (R Grössinger)

Abstract.
GdCo_9-xSi_4+x (x = -0.2 to x = 0.2) and TbCo9Si4 exhibit the tetragonal LaFe9Si4 structure (space group I4/mcm). Magnetically these samples are ferrimagnetic with ordering temperatures close to 50K. The ferrimagnetic magnetization is found to decrease with decreasing Si content, thus, revealing an increasing cobalt sublattice magnetisation. The antiparallel coupling of the Gd- and Co-sublattice magnetisations breaks up at lower critical fields H_l well above 20 T. From the lower critical field H_l as well as from the slope ΔM /ΔH for fields above H_l the inter-sublattice molecular coefficient can be determined which is approximately constant within this solid solution.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588195

http://dx.doi.org/10.1088/1742-6596/51/1/031