|
|||||
|
|
Crystal structures and magnetic properties of CeAu4Si2 and CeAu2Si2 |
|
| Authors: | Athena S. Sefat,Andriy M. Palasyuk,Sergey L. Bud&rsquo ko,John D. Corbett,Paul C. Canfield |
| Affiliation: | a Ames Laboratory, Iowa State University, Ames, IA 50011, USA b Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA c Department of Chemistry, Iowa State University, Ames, IA 50011, USA |
| 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 °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 TN=8.8(1) K and CeAu4Si2 features a ferromagnetic component below Tc=3.3(1) K. Both phases have effective moments close in value to that of free Ce3+. |
| Keywords: | Flux growth Single crystal X-ray diffraction CeAu2Si2 CeAu4Si2 Electrical resistivity Magnetization Specific heat |
| 本文献已被 ScienceDirect 等数据库收录！ | |