Magnetic structure of the intermetallic compound as seen via Mössbauer spectroscopy data for impurity atoms

✍ Scribed by N.N. Delyagin; V.I. Krylov

• Book ID: 104093796
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 264 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.04.007

✦ Synopsis

The magnetic hyperfine interaction for 119 Sn impurity atoms in GdAl 3 frustrated antiferromagnetic compound has been investigated by Mössbauer spectroscopy technique. Two magnetic subspectra with the ratio of the intensities 2:1 were observed. At 4.5 K, the values of the magnetic hyperfine field are 4.00(2) and 1.35(2) T. The peculiarities of the Mössbauer spectrum provide an opportunity to propose a plausible model of the spin arrangement in the GdAl 3 lattice. In each GdAl 3 basal layer, the magnetic moments of the Gd atoms form three-sublattice 120°spin structure that is peculiar to magnetically frustrated compounds. The appearance of two magnetically nonequivalent Sn sites is a result of vector summation of the transferred polarizations from Gd moments located in two adjacent GdAl 3 planes. The anomalous temperature behavior of the hyperfine field is characteristic of frustrated systems with competing exchange interactions.