Propriedades estruturais, eletrônicas e magnéticas dos óxidos La2−xCaxCoIrO6
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2015-02-27
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Universidade Federal de Goiás
Resumo
In this work we describe the synthesis of the novel series La2−xCaxCoIrO6 and
its structural, electronic and magnetic characterization. The main objective of this project
is to investigate the magnetic evolution of the system when modified due to the chemical
substitution of Ca at La site, which can induce changes in the magnetic interactions.
The policristaline samples were synthesized by Solid State Reaction process, and studied
combining global characterization techniques as powder x-ray diffraction, temperature
dependence of magnetic susceptibility and magnetization as a function of applied magnetic
field.
All compounds crystallize in monoclinic structure, with space group P21/n. Magnetic
susceptibility results indicate that the superexchange antiferromagnetic interaction
between Co2+ and Ir4+ in La2CoIrO6 lead to ferrimagnetic behavior due to the different
magnetic moment of the transition metal ions. For the Ca2+ doped at La3+ site compounds,
a magnetic evolution is observed with doping, induced by Co and Ir valence
changes.
As expected, this system presents a strong correlation between its structural,
electronic and magnetic properties, in a way that combining the different results of each
compound we can explain its behavior and understand the big picture of this system.
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L. T. Coutrim. Propriedades estruturais, eletrônicas e magnéticas dos óxidos La2−xCaxCoIrO6. 2015. 77 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2015.