Magnetic and Mössbauer Study of the Novel FeIn2S2Se2 Layered Compound

✍ Scribed by G.F. Goya; A. Memo; H. Haeuseler

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 223 KB
• Volume: 164
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9479

✦ Synopsis

The magnetic properties of the new polymorphic FeIn 2 S 2 Se 2 compound are presented. The system crystallizes in the a-FeGa 2 S 4 structure at low temperatures, and undergoes a transition to a MgAl 2 S 4 -type structure at T48501C. For this high-temperature phase, low-field magnetization data show a peak at T 1 =12.5(5) K, below which magnetic irreversibility is observed. High-temperature susceptibility fits indicate the presence of antiferromagnetic interactions with a high degree of frustration. The effective magnetic moment l eff =4.54(3) l B agrees with the expected 3d 6 (S=2) configuration for Fe 2+ . Mo¨ssbauer spectroscopy showed that Fe 2+ ions are distributed in tetrahedral (A) and octahedral (B) sites with a B:AE1 ratio. The ac susceptibility data were analyzed according to conventional power law dynamics, giving a freezing temperature T g =12.5(2) K and critical exponent zn=6.571, in agreement with Monte Carlo simulations for 3D short-range Ising spinglass systems.