Insight on the electronic state of Sr2IrO4 revealed by cationic substitutions
Insight on the electronic state of Sr2IrO4 revealed by cationic substitutions
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DOI：
10.1088/0953-8984/20/29/295201
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发表时间：
2008-06
期刊：
影响因子：
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通讯作者：
Y. Klein;I. Terasaki
中科院分区：
文献类型：
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作者：
Y. Klein;I. Terasaki
我们报告了在室温下测量的 Sr2−xLaxIrO4（x = 0 和 0.05）和 Sr2Ir1−yRhyO4（y = 0.05、0.1 和 0.2）的电阻率、热电势和磁化强度。在Sr2IrO4中，可以掺杂电子（La取代）或空穴（Rh取代），从而导致电阻率大幅降低。特别是，在Rh掺杂的情况下实现了近金属态。当 y = 0.2 时，热电势类似于金属。电子能带结构中间隙的存在对于这些取代是稳健的。从各种实验数据中，可以看出与 3D 电荷密度波化合物 BaBiO3 的相似之处。然而，我们的方案暗示存在自旋密度波，而不是电荷密度波。
We report the electrical resistivity, thermoelectric power and magnetization of Sr2−xLaxIrO4 (x = 0 and 0.05) and Sr2Ir1−yRhyO4 (y = 0.05, 0.1 and 0.2) measured below room temperature. In Sr2IrO4, electrons (La substitution) or holes (Rh substitution) can be doped, which lead to a strong decrease of the resistivity. In particular, a nearly-metallic state is realized in the case of Rh doping. The thermoelectric power turns out to be metallic-like for y = 0.2. The presence of a gap in the electronic band structure is robust against these substitutions. From various experimental data, similarities with the 3D charge density wave compound, BaBiO3, are suggested. Nevertheless, rather than a charge density wave, our scenario implies the presence of a spin density wave.