Portal de Periódicos da CAPES

Effects of Co for Mn substitution on the electronic properties of Mn2-xCoxVAl as probed by XPS

2017; Elsevier BV; Volume: 93; Linguagem: Inglês

10.1016/j.intermet.2017.12.003

1879-0216

Radu Cristian Gavrea, Cristian Leoștean, M. Coldea, O. Isnard, V. Pop, D. Benea,

ZnO doping and properties

Detailed theoretical and experimental investigations on the electronic and magnetic properties of the Heusler compounds Mn2-xCoxVAl with L21 structure are presented. The samples have been examined by X-ray diffraction, magnetization measurements and X-ray photoemission. The magnetic measurements show that the Curie temperatures decrease with Co content, ranging between 771 K (x = 0) and 289 K (x = 1), while the magnetization of the samples follows the Slater-Pauling rule. Additionally, electronic band structure calculations using the Korringa-Kohn-Rostoker (KKR) Greens function method have been performed. The evolution of the half-metallic character with the Co content x in the Mn2-xCoxVAl alloys is discussed based on the density of states (DOS) calculations. The influence of the Co doping on the individual magnetic moments of the Mn and V has been evidenced. Also, the small individual spin moments of Mn and V determined by theoretical calculations in MnCoVAl (x = 1) are confirmed by the Mn 3s and V 3s core level analysis of the X-ray photoemission spectroscopy investigations.