Magnetic structure of Tb3Cu4Si4

✍ Scribed by E. Wawrzyńska; B. Penc; N. Stüsser; A. Szytuła; Z. Tomkowicz

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 331 KB
• Volume: 126
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00184-4

✦ Synopsis

Polycrystalline sample of Tb 3 Cu 4 Si 4 compound was prepared and studied by magnetic and powder neutron diffraction measurements. Tb 3 Cu 4 Si 4 crystallizes in the orthorhombic Gd 3 Cu 4 Ge 4 -type structure (space group Immm). In this structure the Tb atoms occupy two non-equivalent crystallographic positions: 2d and 4e. Below T N equal to 50 K the Tb moment in the 2d site orders and forms a collinear magnetic structure. At the temperature of T t1 ¼ 38 K a transition from the commensurate magnetic structure, described by the propagation vector k 2 ¼ ð0; 1 2 ; 0Þ to an incommensurate one, described by the propagation vector k 1 ¼ ð0; 0:515; 0Þ; is observed. Below T t2 equal to 7 K the Tb moment in the 4e site forms a sine-wave modulated structure described by the propagation vector k 3 ¼ ð0:23; 1 2 ;