Structural changes through the first-order paramagnetic-antiferromagnetic phase transition of Dy3Ru4Al12 at 7 K have been studied by means of X-ray diffraction and thermal expansion measurements. The compound crystallizes in a hexagonal crystal structure of Gd3Ru4Al12 type (P63/mmc space group), and no structural phase transition has been found in the temperature interval between 2.5 and 300 K. Nevertheless, due to the spin-lattice coupling the crystal volume undergoes a small orthorhombic distortion of the order of 2×10-5 as the compound enters the antiferromagnetic state. We propose that the first-order phase transition is not driven by the structural changes but rather by the exchange interactions present in the system.

CCTN IST CFMCUL University of Lisbon Nuclear and Technological Campus P 2695 066 Bobadela Portugal

Charles University Prague Faculty of Mathematics and Physics Department of Condensed Matter Physics Ke Karlovu 5 121 16 Prague Czech Republic

Dresden High Magnetic Field Laboratory Helmholtz Zentrum Dresden Rossendorf D 01314 Dresden Germany

Institute of Physics Academy of Sciences Na Slovance 2 182 21 Prague Czech Republic

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