Layered Cobaltites: Synthesis, Oxygen Nonstoichiometry, Transport and Magnetic Properties
- Conder, K.
- Podlesnyak, A.
- Pomjakushina, E.
- Stingaciu, M.
DOIAbstract
Complex cobalt oxide perovskite-derived compounds with a general formula LnBaCo$\text{}_{2}$O$\text{}_{5+x}$ (Ln = rare earth) attracted considerable interests because of their interesting properties: magnetic and metal-insulator transitions, giant magnetoresistance, ionic conductivity, and a structural similarity to high temperature superconductors. All the compounds are oxygen non-stoichiometric (0<x<1) and the cobalt cations can adopt different oxidation and spin states. Compounds with x≈0.5 display a metal-insulator transition. We found that this transition is affected by an oxygen isotope substitution and is accompanied by structural changes and melting of the orbital ordering. Studies of the metal-insulator transition qualitatively su...
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