Magneto-elastic coupling across the first-order transition in the distorted kagome lattice antiferromagnet Dy.sub.3./sub.Ru.sub.4./sub.Al.sub.12./sub.

0458892 - FZÚ 2017 RIV NL eng J - Journal Article
Henriques, Margarida Isabel Sousa - Gorbunov, Denis - Kriegner, D. - Vališka, M. - Andreev, Alexander V. - Matěj, Z.
Magneto-elastic coupling across the first-order transition in the distorted kagome lattice antiferromagnet Dy₃Ru₄Al₁₂.
Journal of Magnetism and Magnetic Materials. Roč. 400, Feb (2016), 125-129. ISSN 0304-8853. E-ISSN 1873-4766
Institutional support: RVO:68378271
Keywords : first-order transition * magneto-elastic coupling * thermal expansion * low-temperature X-ray diffraction
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.630, year: 2016

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, 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.

Permanent Link: http://hdl.handle.net/11104/0259108