Epitaxial synthesis and physical properties of double-perovskite oxide Sr2CoRuO6 thin films
Epitaxial synthesis and physical properties of double-perovskite oxide Sr2CoRuO6 thin films
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DOI：
10.1088/0953-8984/28/43/436005
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
K. Watarai;K. Yoshimatsu;K. Horiba;K. Horiba;H. Kumigashira;H. Kumigashira;Osami Sakata;Osami Sakata;Akira Ohtomo
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文献类型：
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作者：
K. Watarai;K. Yoshimatsu;K. Horiba;K. Horiba;H. Kumigashira;H. Kumigashira;Osami Sakata;Osami Sakata;Akira Ohtomo
报道了用脉冲激光沉积法生长的双钙钛矿结构Sr 2CoRuO 6薄膜的外延结构和物理性质。通过改变生长温度得到Co/Ru有序度为2-73%的样品。X射线吸收光谱（XAS）的最高有序样品显示，钴离子是三价的高自旋配置和钌离子是五价。我们发现最高和最低有序样品之间的磁化强度和电阻率存在很大差异，并且没有强磁性和金属性，这是SrCoO 3和SrRuO 3的共同特征。使用共振光电子能谱和XAS，占主导地位的d-轨道组件的顶部的占用状态（底部的未占用状态）被确定为Ru 4d t2 g（Co 3d和Ru 4d t2 g）。这些结果表明，双钙钛矿结构的Sr 2CoRuO 6的基态是亚铁磁绝缘体。
We report epitaxial structures and physical properties of double-perovskite Sr2CoRuO6 films grown using pulsed-laser deposition. Samples with a degree of Co/Ru order of 2–73% were obtained by changing growth temperature. X-ray absorption spectroscopy (XAS) on the highest ordered sample revealed that Co ions were trivalent with a high-spin configuration and Ru ions were pentavalent. We found large differences in magnetization and resistivity between the highest and lowest ordered samples as well as the absence of strong magnetism and metallicity, which are common characteristics of SrCoO3 and SrRuO3. Using resonant photoemission spectroscopy and XAS, dominant d-orbital components at the top of the occupied state (the bottom of the unoccupied state) were identified to be Ru 4d t2g (Co 3d and Ru 4d t2g). These results suggest that the ground state of double-perovskite Sr2CoRuO6 is a ferrimagnetic insulator.