necessary for a successful neutron diffraction experiment with the SmPd$_{2}$Al$_{3}$ crystal. This work is part of research plan MSM 0021620834 financed by the Ministry of Education of the Czech Republic. This work was also supported by grants of the Czech Science Foun- dation nos. 202/09/1027 and, 202/09/P354 and the Grant Agency of Charles University no. 252504. Acknowledgments 13 1 G.H. Dieke, Spectra and Energy Levels of Rare Earth Ions in Crystals, John Wiley and Sons, 1968, USA. ∗ Electronic address: jiri.pospisil@centrum.cz 2 H. de Wijn, A. van Diepen, and K. Buschow, Phys.Rev. 161 , 253 (1967). 3 Z. Liu, Phys.Rev. B 64 , 144407 (2001). 4 H. Kitazawa, A. Mori, S. Takano, T. Yamadaya, A. Matsushita, and T. Matsumoto, Physica B 186-188 , 661 (1993). 5 C. Geibel, C. Schank, S. Thies, H. Kitazawa, C. Bredl, A. Bohm, M. Rau, A. Grauel, R. Caspary, R. Helfrich, et al., Z Phys. B 84 , 1 (1991). 6 V. S. Zapf, R. P. Dickey, E. J. Freeman, C. Sirvent, and M. B. Maple, Phys. Rev. B 65 , 024437 (2001). 7 S. Mentink, N. Bos, G. Nieuwenhuys, A. Menovsky, and J. Mydosh, Physica B 186-188 , 497 (1993). 8 H. Ghosh, S. Ramakrishhnan, A. Chinchure, V. Marathe, and G. Chandra, Physica B 223-224 , 354 (1996). 9 S. Suga, M. Takeda, Y. Mori, N. Shino, S. Imada, and H. Kitazawa, Physica B 186-188 , 63 (1993). 10 K. Ghosh, S. Ramakrishnan, S. K. Malik, and G. Chandra, Phys. Rev. B 48 , 6249 (1993). 11 A. Donni, H. Kitazawa, P. Fischer, T. Vogt, A. Matsushita, Y. Iimura, and M. Zolliker, Journal of Solid State Chemistry 127 , 169 (1996). 12 G. Motoyama, T. Nishioka, and N. Sato, J. Phys. Soc. Jpn. 71 , 1609 (2002).