Crystal structures and magnetic properties of CeAu4Si2 and CeAu2Si2

TitleCrystal structures and magnetic properties of CeAu4Si2 and CeAu2Si2
Publication TypeJournal Article
Year of Publication2008
AuthorsSefat AS, Palasyuk AM, Bud'ko SL, Corbett JD, Canfield PC
Journal TitleJournal of Solid State Chemistry
Volume181
Pages282-293
Date PublishedFeb
Type of ArticleArticle
ISBN Number0022-4596
Accession NumberISI:000253185900011
Keywordsantiferromagnetism, CE, CeAu2Si2, CeAu4Si2, electrical resistivity, ferromagnetism, flux growth, growth, KONDO-LATTICE SYSTEMS, magnetization, pressure, rare-earth compounds, single crystal, SINGLE-CRYSTAL, specific heat, susceptibility, x-ray diffraction
Abstract

Single crystals of CeAu4Si2 and CeAu2Si2 have been grown out of ternary fluxes rich in Au, and the former, also by sintering the stoichiometric composition at 750 degrees C. The single-crystal X-ray refinement result for CeAu4Si2 is orthorhombic, Cmmm (No. 65, Z = 2), different from a tetragonal result found from an X-ray powder diffraction refinement [H. Nakashima, et al., J. Alloys Compds. 424 (2006) 7]. For CeAu2Si2, this is the first report of the stoichiometric crystalline phase, in the known tetragonal I4/mmm structure. The anisotropic field- and temperature-dependent magnetizations, as well as specific heat and resistivity data are compared. Although both compounds have related structural packing, they present unique magnetic features. CeAu2Si2 is a typical antiferromagnet with T-N = 8.8(1) K and CeAu4Si2 features a ferromagnetic component below T-c = 3.3(1) K. Both phases have effective moments close in value to that of free Ce3+. Published by Elsevier Inc.

DOI10.1016/j.jssc.2007.11.029
Alternate JournalJ. Solid State Chem.