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Your search keyword '"Ortmann, John. E."' showing total 6 results
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6 results on '"Ortmann, John. E."'

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

Author

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

Subjects
Condensed Matter - Materials Science
Abstract

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.

Published
2018
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3. Point defects at cleaved Sr$_{n+1}$Ru$_n$O$_{3n+1}$(001) surfaces

Author

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

Subjects
Condensed Matter - Materials Science, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences
Abstract

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.

Published
2018

5. Point defects at cleavedSrn+1RunO3n+1(001) surfaces

Author

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

Published
2014
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6. Point defects at cleaved Srn+1RunO3n+1(001) surfaces.

Author

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

Subjects
*POINT defects, *DENSITY functional theory, *CRYSTAL structure research, *PEROVSKITE crystallography, *SCANNING tunneling microscopy, *ELECTRON bombardment conductivity
Abstract

The (001) surfaces of cleaved Sr3RuO4 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 × 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. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
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