Solin N.I.
1, Naumov S.V.
1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: solin@imp.uran.ru
In cobaltites DyBaCo2O5.49, the spin state of Co3+ ions near the metal-insulator transition was determined for the first time. In the non-conducting phase, as in other rare earth (R) cobaltites RBaCo2O5.50, Co3+ ions are in low (LS, S=0) and intermediate (IS, S=1) spin states. In the metal phase, Co3+ ions are in an intermediate (IS, S=1) spin state. The metal-insulator transition occurs when the spin state of Co3+ ions from IS/LS in octahedra changes, without changing the IS state in pyramids. Temperature hysteresis of magnetization shows that the metal-insulator transition in DyBaCo2O5.50 is a first-order phase transition. It is assumed that the metamagnetic behavior of rare earth cobaltites RBaCo2O5.50 is due to their layered structure and is determined by the size of the rare earth ion. Keywords: metalI-insulator transition, rare earth ion, metamagnetic behavior.
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