Successive Electronic Transitions and Anisotropic Properties in a Double-Perovskite SmBaMn<sub>2</sub>O<sub>6</sub>Single Crystal

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  • Shigeki Yamada
    Faculty of Science, Yokohama City University, Yokohama 236-0027, Japan
  • Youichi Maeda
    Faculty of Science, Yokohama City University, Yokohama 236-0027, Japan
  • Taka-hisa Arima
    Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan

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We have succeeded in growth of large high-quality single crystals of SmBaMn 2 O 6 and measured their magnetism and electrical transport properties. The temperature dependence of the magnetization and resistivity exhibits anomalies at ∼375 and ∼200 K. The anomalies accompany hystereses and can be assigned to ordering and rearrangement transitions of charge and orbital of Mn ions, respectively. A broad peak in magnetic susceptibility at 250 K observed for pulverized samples is strongly suppressed in the case of single crystal. Magnetic susceptibility for a magnetic field parallel to the a -axis shows a kink at 175 K, below which a magnetic anisotropy emerges. The result indicates an antiferromagnetic transition of the Mn spin moments below the charge and orbital rearrangement transition, disagreeing with previous studies of polycrystalline samples.

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