Neutron Diffraction Study of the Ternary Transition Metal Zintl Compound Ca14MnSb11

✍ Scribed by Hyungrak Kim; Qingzhen Huang; Jeffrey W. Lynn; Susan M. Kauzlarich

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 690 KB
• Volume: 168
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2002.9705

✦ Synopsis

The magnetic ordering of the tetragonal Ca 14 MnSb 11 compound (space group I4 1 /acd) has been determined by highresolution neutron diffraction on powder samples. Neutron data were obtained at temperatures of 1.4, 10, 95 K, and room temperature. Refinement of the magnetic structure reveals a ferromagnetic ordering of Mn magnetic moments lying in the a2b plane below the T C of 63 K. The low-temperature-ordered magnetic moment on the Mn ion is 3.4(2) l B at 1.4 K. The results are confirmed by magnetic susceptibility measurements, which show that the easy magnetization direction of the compound is perpendicular to the c-axis and the system orders ferromagnetically at 63 K, in good agreement with neutron diffraction results. A large negative magnetoresistance effect ðDq=qðHÞ ¼ À34:4%) at the magnetic transition temperature is observed in applied magnetic fields up to 6 T.