Successive Electronic Transitions and Anisotropic Properties in a Double-Perovskite SmBaMn2O6Single Crystal
Successive Electronic Transitions and Anisotropic Properties in a Double-Perovskite SmBaMn2O6Single Crystal
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双钙钛矿 SmBaMn2O6 单晶中的连续电子跃迁和各向异性特性
DOI：
10.1143/jpsj.81.113711
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发表时间：
2012
影响因子：
1.7
通讯作者：
T. Arima
中科院分区：
文献类型：
--
作者：
S. Yamada;Y. Maeda;T. Arima
我们成功地生长了大尺寸、高质量的SmBaMn2O6单晶，并测试了它们的磁性和电输运性质。磁化强度和电阻率随温度的变化在∼375K和∼200K表现出反常现象，这种反常现象伴随着磁滞，可分别归结为Mn离子的电荷有序跃迁和重排跃迁。粉末状样品的磁化率在250K出现一个宽峰，而单晶样品则受到强烈的抑制。平行于a轴的磁场的磁化率在175K出现一个拐点，低于这个拐点就会出现磁各向异性。结果表明，在电荷重排和轨道重排转变下，Mn的自旋矩发生了反铁磁性转变，这与以前对多晶样品的研究不一致。
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.