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arXiv 1804.04415cond-mat.mtrl-sci
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Sr $_{n+1}$ Ru $_n$ O $_{3n+1}$(001)解理面上的点缺陷

Point defects at cleaved Sr$_{n+1}$Ru$_n$O$_{3n+1}$(001) surfaces

Bernhard Stöger, Marcel Hieckel, Florian Mittendorfer, Zhiming Wang, Michael Schmid, Gareth S. Parkinson, David Fobes, Jin Peng, John. E. Ortmann, Andreas Limbe… 展开作者

Bernhard Stöger, Marcel Hieckel, Florian Mittendorfer, Zhiming Wang, Michael Schmid, Gareth S. Parkinson, David Fobes, Jin Peng, John. E. Ortmann, Andreas Limbeck, Zhiqiang Mao, Josef Redinger, Ulrike Diebold

摘要:

利用低温扫描隧道显微镜和密度泛函理论研究了Sr $_3$ Ru $_2$ O $_7$和Sr $_2$ RuO $_4$的(001)解理面.在解理过程中不会产生本征缺陷。该实验观察结果与计算结果一致,其中Sr和O空位的形成能分别为4.19 eV和3.81 eV,显著大于切割晶体所需的能量1.11 eV/(1 $\times$ 1)晶胞。表面氧空位可以通过电子轰击,但是,它们的外观示出强烈的成像条件而变化。在解理表面上观察到的点缺陷是由于大量杂质和残余气体的吸附造成的。

英文摘要:

The (001) surfaces of cleaved Sr$_3$Ru$_2$O$_7$ and Sr$_2$RuO$_4$ samples were investigated using low-temperature scanning tunneling microscopy and density functional theory calculations. Intrinsic defects are not created during cleaving. This experimental observation is consistent with calculations, where the formation energy for a Sr and O vacancy, 4.19 eV and 3.81 eV, respectively, is significantly larger than that required to cleave the crystal, 1.11 eV/(1 $\times$ 1) unit cell. Surface oxygen vacancies can be created through electron bombardment, however, and their appearance is shown to vary strongly with the imaging conditions. Point defects observed on as-cleaved surfaces result from bulk impurities and adsorption from the residual gas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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