Magneto-elastic coupling across the first-order transition in the distorted kagome lattice antiferromagnet Dy3Ru4Al12

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:400

Article; Proceedings Paper

Henriques, M. S.^1,2  Gorbunov, D. I.^1,3  Kriegner, D.⁴  Valiska, M.⁴  Andreev, A. V.¹  Matej, Z.⁴ 

[1] Acad Sci Czech Republ, Inst Phys, Na Slovance 2, Prague 18221, Czech Republic

[2] Univ Lisbon, CCTN, IST CFMCUL, P-2695066 Bobadela, Portugal

[3] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab HLD EMFL, D-01314 Dresden, Germany

[4] Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Prague 12116, Czech Republic

关键词: First-order transition;    Magneto-elastic coupling;    Thermal expansion;    Low-temperature X-ray diffraction;   

DOI  :  10.1016/j.jmmm.2015.07.066

来源: Elsevier

【 摘 要 】

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 (P6(3)/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 x 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. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free