Spin - glass behaviour in some mixed-metal oxidic systems

• Published in: Progress in crystal growth and characterization of materials Vol. 45; no. 1; pp. 143 - 146
• Main Author: Darshane, V.S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 2002; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetism and Solid-solution; Mixed metal oxides; Physics; Spin glass; Spin glasses and other random magnets; Studies of specific magnetic materials; Magnetism and Solid-solution; Spin glass; Mixed metal oxides; Nickel oxides; Spin glasses; Moessbauer effect; Inorganic compounds; Magnetic ordering; Transition element compounds; Cobalt oxides; Composition effect; Coexistence; Experimental study; Magnetic susceptibility; Gallium oxides; Manganese oxides; Multi-element compounds; Ferrimagnetism; Chemical composition; Iron oxides; Quaternary compounds
• ISSN: 0960-8974; 1878-4208
• DOI: 10.1016/S0960-8974(02)00040-2

The systems Fe 1−xGa xMnNiO 4 and CoFe 2−xGa xO 4 have been investigated using low temperature Mössbauer and ac susceptibility techniques for investigation of spin-glass behaviour. Mössbauer measurements at liquid nitrogen temp. for the system Fe 1−xGa xMnNiO 4 indicated the presence of “ferri spin-glass state” in the system where long range ferrimagnetic and frustrated spin-glass ordering coexist. Ac susceptibility measurements for the system CoFe 2−xGa xO 4 indicated that compositions with X=0.25 and 0.5 undergo ferrimagnetic transition at T N and on further cooling enter a spin-glass state with the magnetization of clusters being randomly frozen.