New A-site Ordered Perovskite Cobaltite LaBaCo<sub>2</sub>O<sub>6</sub>: Synthesis, Structure, Physical Property and Cation Order–Disorder Effect

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  • Nakajima Tomohiko
    Materials Design and Characterization Laboratory, Institute for Solid State Physics, The University of Tokyo
  • Ichihara Masaki
    Materials Design and Characterization Laboratory, Institute for Solid State Physics, The University of Tokyo
  • Ueda Yutaka
    Materials Design and Characterization Laboratory, Institute for Solid State Physics, The University of Tokyo

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  • New A-site Ordered Perovskite Cobaltite LaBaCo2O6: Synthesis, Structure, Physical Property and Cation Order-Disorder Effect

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By means of annealing LaBaCo2O5 under high pressure oxygen, we have successfully synthesized a new A-site ordered perovskite cobaltite, LaBaCo2O6. The structure and electromagnetic properties of LaBaCo2O6 have been investigated and compared to those of the ordinary A-site disordered La0.5Ba0.5CoO3. Both LaBaCo2O6 and La0.5Ba0.5CoO3 have mixed states of low-spin and intermediate-spin states and show metallic behaviors generated by double exchange interaction. LaBaCo2O6 has a ferromagnetic transition at TC=175 K, which is lower by 15 K than TC of La0.5Ba0.5CoO3. At around 140 K, some structural changes are observed in both compounds and below the temperature they exhibit magnetic glassy (cluster glass) behaviors, accompanied by the gradual change to insulating or simiconductive behaviors. The refined structural data and magnetic and electrical properties suggest a partial dx2−y2 orbital ordering for LaBaCo2O6 below 140 K, in contrast to a partial d3z2−r2 orbital ordering for La0.5Ba0.5CoO3.

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