ChemInform Abstract: Spin Glass Behavior of Isolated, Geometrically Frustrated Tetrahedra of Iron Atoms in the Intermetallic La₂₁Fe₈Sn₇C₁₂.

Abstract

are synthesized from mixtures of the elements using an eutectic La/Ni mixture as flux. Single crystals of La21Fe8Sn7C12 are characterized by XRD, SEM, and magnetic susceptibility measurements. The compound crystallizes in the space group Fm3m with Z = 4. The structure contains isolated Fe tetrahedra edge-capped by carbon in an extended La/Sn network. The antiferromagnetic coupling of the Fe atoms is frustrated by their ideal tetrahedral arrangement. Below 5 K, a separation between zero-field-cooled and field-cooled susceptibilities occurs, indicating a spin glass transition. -(BENBOW, E. M.; DALAL, N. S.; LATTURNER*, S. E.; J. Am. Chem. Soc. 131 (2009) 9, 3349-3354; Dep. Chem. Biochem., Fla. State Univ., Tallahassee, FL 32306, USA; Eng.) -W. Pewestorf 21-010