Point defects at cleaved Srn+1 RunO3n+1(001) surfaces

Article

关键词: ELECTRONIC-STRUCTURE;    SR2RUO4;    SR3RU2O7;    SUPERCONDUCTIVITY;    PEROVSKITE;    CRYSTAL;    LIQUID;    SRTIO3;    STATES;    SRRUO3;   

DOI  :  10.1103/PhysRevB.90.165438

来源: SCIE

【 摘 要 】

The (001) surfaces of cleaved Sr3Ru2O7 and Sr2RuO4 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 x 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.

【 授权许可】

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