Stoichiometry dependence of potential screening at La ( 1 - δ ) Al ( 1 + δ ) O 3 / SrTiO 3 interfaces

Weiland, Conan; Sterbinsky, George E.; Rumaiz, Abdul K.; Hellberg, C. Stephen; Woicik, Joseph C.; Zhu, Shaobo; Schlom, Darrell G.

doi:10.1103/PhysRevB.91.165103

Title: Stoichiometry dependence of potential screening at $La_{(1 - δ)} Al_{(1 + δ)} O_{3} / SrTiO_{3}$ interfaces

Journal Article · Fri Apr 03 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.165103· OSTI ID:1177475

Weiland, Conan; Sterbinsky, George E.; Rumaiz, Abdul K.; Hellberg, C. Stephen; Woicik, Joseph C.; Zhu, Shaobo; Schlom, Darrell G.

Hard x-ray photoelectron spectroscopy (HAXPES) and variable kinetic energy x-ray photoelectron spectroscopy (VKE-XPS) analyses have been performed on ten-unit-cell-thick La_(1-δ)Al_(1+δ)O₃ films, with La:Al ratios of 1.1, 1.0, and 0.9, deposited on SrTiO₃. Only Al-rich films are known to have a conductive interface. VKE-XPS, coupled with maximum entropy analysis, shows significant differences in the compositional depth profile among the Al-rich, La-rich, and stoichiometric films: significant La enrichment at the interface is observed in the La-rich and stoichiometric films, while the Al-rich film shows little to no intermixing. Additionally, the La-rich and stoichiometric films show a high concentration of Al at the surface, which is not observed in the Al-rich film. HAXPES valence band (VB) analysis shows a broadening of the VB for the Al-rich sample relative to the stoichiometric and La-rich samples. This broadening is consistent with an electric field across the Al-rich film. These results are consistent with a defect-driven electronic reconstruction.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-98CH10886

OSTI ID:: 1177475

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Vol. 91 Journal Issue: 16; ISSN 1098-0121

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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References (37)

The electron attenuation length revisited Jablonski, A. Surface Science Reports, Vol. 47, Issue 2-3 https://doi.org/10.1016/S0167-5729(02)00031-6	journal	June 2002
Generalized Gradient Approximation Made Simple Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868 https://doi.org/10.1103/PhysRevLett.77.3865	journal	October 1996
Magnetic effects at the interface between non-magnetic oxides Brinkman, A.; Huijben, M.; van Zalk, M. Nature Materials, Vol. 6, Issue 7, p. 493-496 https://doi.org/10.1038/nmat1931	journal	June 2007
Projector augmented-wave method Blöchl, P. E. Physical Review B, Vol. 50, Issue 24, p. 17953-17979 https://doi.org/10.1103/PhysRevB.50.17953	journal	December 1994
Oxide Interfaces--An Opportunity for Electronics Mannhart, J.; Schlom, D. G. Science, Vol. 327, Issue 5973, p. 1607-1611 https://doi.org/10.1126/science.1181862	journal	March 2010
Nondestructive compositional depth profiling using variable-kinetic energy hard X-ray photoelectron spectroscopy and maximum entropy regularization: Depth profiling by VKE-XPS Weiland, C.; Krajewski, J.; Opila, R. Surface and Interface Analysis, Vol. 46, Issue 6 https://doi.org/10.1002/sia.5517	journal	April 2014
Hard x-ray photoemission and density functional theory study of the internal electric field in SrTiO $_{3}$ /LaAlO $_{3}$ oxide heterostructures Slooten, E.; Zhong, Zhicheng; Molegraaf, H. J. A. Physical Review B, Vol. 87, Issue 8 https://doi.org/10.1103/PhysRevB.87.085128	journal	February 2013
Understanding the mechanism of conductivity at the LaAlO3/SrTiO3(001) interface Chambers, Scott A. Surface Science, Vol. 605, Issue 13-14 https://doi.org/10.1016/j.susc.2011.04.011	journal	July 2011
PHOTOELECTRON ANGULAR DISTRIBUTION PARAMETERS FOR ELEMENTS Z=55 to Z=100 IN THE PHOTOELECTRON ENERGY RANGE 100–5000 eV Trzhaskovskaya, M. B.; Nefedov, V. I.; Yarzhemsky, V. G. Atomic Data and Nuclear Data Tables, Vol. 82, Issue 2 https://doi.org/10.1006/adnd.2002.0886	journal	November 2002
Hybridization and Bond-Orbital Components in Site-Specific X-Ray Photoelectron Spectra of Rutile $T i O_{2}$ Woicik, J. C.; Nelson, E. J.; Kronik, Leeor Physical Review Letters, Vol. 89, Issue 7 https://doi.org/10.1103/PhysRevLett.89.077401	journal	July 2002
Polar-on-nonpolar epitaxy Kroemer, Herbert Journal of Crystal Growth, Vol. 81, Issue 1-4 https://doi.org/10.1016/0022-0248(87)90391-5	journal	February 1987
Note: Alignment/focus dependent core-line sensitivity for quantitative chemical analysis in hard x-ray photoelectron spectroscopy using a hemispherical electron analyzer Weiland, Conan; Browning, Raymond; Karlin, Barry A. Review of Scientific Instruments, Vol. 84, Issue 3 https://doi.org/10.1063/1.4795406	journal	March 2013
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set Kresse, G.; Furthmüller, J. Physical Review B, Vol. 54, Issue 16, p. 11169-11186 https://doi.org/10.1103/PhysRevB.54.11169	journal	October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method Kresse, G.; Joubert, D. Physical Review B, Vol. 59, Issue 3, p. 1758-1775 https://doi.org/10.1103/PhysRevB.59.1758	journal	January 1999
LaAlO3 stoichiometry is key to electron liquid formation at LaAlO3/SrTiO3 interfaces Warusawithana, M. P.; Richter, C.; Mundy, J. A. Nature Communications, Vol. 4, Issue 1 https://doi.org/10.1038/ncomms3351	journal	August 2013
Structure-Property Relation of SrTiO₃/LaAlO₃ Interfaces Huijben, Mark; Brinkman, Alexander; Koster, Gertjan Advanced Materials, Vol. 21, Issue 17, p. 1665-1677 https://doi.org/10.1002/adma.200801448	journal	May 2009
Polar oxide surfaces Noguera, Claudine Journal of Physics: Condensed Matter, Vol. 12, Issue 31 https://doi.org/10.1088/0953-8984/12/31/201	journal	July 2000
PHOTOELECTRON ANGULAR DISTRIBUTION PARAMETERS FOR ELEMENTS Z=1 TO Z=54 IN THE PHOTOELECTRON ENERGY RANGE 100–5000 eV Trzhaskovskaya, M. B.; Nefedov, V. I.; Yarzhemsky, V. G. Atomic Data and Nuclear Data Tables, Vol. 77, Issue 1 https://doi.org/10.1006/adnd.2000.0849	journal	January 2001
Epitaxial SrTiO₃ films with electron mobilities exceeding 30,000 cm² V^-1 s^-1 Son, Junwoo; Moetakef, Pouya; Jalan, Bharat Nature Materials, Vol. 9, Issue 6, p. 482-484 https://doi.org/10.1038/nmat2750	journal	April 2010
Band alignment in LaAlO $_{3}$ /SrTiO $_{3}$ oxide heterostructures inferred from hard x-ray photoelectron spectroscopy Berner, G.; Müller, A.; Pfaff, F. Physical Review B, Vol. 88, Issue 11 https://doi.org/10.1103/PhysRevB.88.115111	journal	September 2013
Nanoscale control of an interfacial metal–insulator transition at room temperature Cen, C.; Thiel, S.; Hammerl, G. Nature Materials, Vol. 7, Issue 4 https://doi.org/10.1038/nmat2136	journal	March 2008
A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface Ohtomo, A.; Hwang, H. Y. Nature, Vol. 427, Issue 6973 https://doi.org/10.1038/nature02308	journal	January 2004
Origin of Charge Density at ${LaAlO}_{3}$ on ${SrTiO}_{3}$ Heterointerfaces: Possibility of Intrinsic Doping Siemons, Wolter; Koster, Gertjan; Yamamoto, Hideki Physical Review Letters, Vol. 98, Issue 19, Article No. 196802 https://doi.org/10.1103/PhysRevLett.98.196802	journal	May 2007
Why some interfaces cannot be sharp Nakagawa, Naoyuki; Hwang, Harold Y.; Muller, David A. Nature Materials, Vol. 5, Issue 3, p. 204-209 https://doi.org/10.1038/nmat1569	journal	January 2006
Tunable Quasi-Two-Dimensional Electron Gases in Oxide Heterostructures Thiel, S. Science, Vol. 313, Issue 5795, p. 1942-1945 https://doi.org/10.1126/science.1131091	journal	September 2006
Oxygen vacancies in N doped anatase TiO2: Experiment and first-principles calculations Rumaiz, Abdul K.; Woicik, J. C.; Cockayne, E. Applied Physics Letters, Vol. 95, Issue 26 https://doi.org/10.1063/1.3272272	journal	December 2009
Profiling the Interface Electron Gas of ${LaAlO}_{3} / {SrTiO}_{3}$ Heterostructures with Hard X-Ray Photoelectron Spectroscopy Sing, M.; Berner, G.; Goß, K. Physical Review Letters, Vol. 102, Issue 17 https://doi.org/10.1103/PhysRevLett.102.176805	journal	April 2009
Built-in and induced polarization across LaAlO3/SrTiO3 heterojunctions Singh-Bhalla, Guneeta; Bell, Christopher; Ravichandran, Jayakanth Nature Physics, Vol. 7, Issue 1 https://doi.org/10.1038/nphys1814	journal	October 2010
Effect of Growth Induced (Non)Stoichiometry on Interfacial Conductance in ${LaAlO}_{3} / {SrTiO}_{3}$ Breckenfeld, E.; Bronn, N.; Karthik, J. Physical Review Letters, Vol. 110, Issue 19 https://doi.org/10.1103/PhysRevLett.110.196804	journal	May 2013
The stability of ionic crystal surfaces Tasker, P. W. Journal of Physics C: Solid State Physics, Vol. 12, Issue 22 https://doi.org/10.1088/0022-3719/12/22/036	journal	November 1979
Effect of oxygen vacancies in the ${SrTiO}_{3}$ substrate on the electrical properties of the ${LaAlO}_{3} ∕ {SrTiO}_{3}$ interface Kalabukhov, Alexey; Gunnarsson, Robert; Börjesson, Johan Physical Review B, Vol. 75, Issue 12 https://doi.org/10.1103/PhysRevB.75.121404	journal	March 2007
Instability, intermixing and electronic structure at the epitaxial LaAlO3/SrTiO3(001) heterojunction Chambers, S. A.; Engelhard, M. H.; Shutthanandan, V. Surface Science Reports, Vol. 65, Issue 10-12 https://doi.org/10.1016/j.surfrep.2010.09.001	journal	October 2010
A polarity-induced defect mechanism for conductivity and magnetism at polar–nonpolar oxide interfaces Yu, Liping; Zunger, Alex Nature Communications, Vol. 5, Issue 1 https://doi.org/10.1038/ncomms6118	journal	October 2014
Mapping Band Alignment across Complex Oxide Heterointerfaces Huang, Bo-Chao; Chiu, Ya-Ping; Huang, Po-Cheng Physical Review Letters, Vol. 109, Issue 24 https://doi.org/10.1103/PhysRevLett.109.246807	journal	December 2012
Composition, structure, and stability of ${RuO}_{2} (110)$ as a function of oxygen pressure Reuter, Karsten; Scheffler, Matthias Physical Review B, Vol. 65, Issue 3 https://doi.org/10.1103/PhysRevB.65.035406	journal	December 2001
X-ray photoemission studies of the metal-insulator transition in ${LaAlO}_{3} / {SrTiO}_{3}$ structures grown by molecular beam epitaxy Segal, Y.; Ngai, J. H.; Reiner, J. W. Physical Review B, Vol. 80, Issue 24 https://doi.org/10.1103/PhysRevB.80.241107	journal	December 2009
Simulation of electron spectra for surface analysis (SESSA): a novel software tool for quantitative Auger-electron spectroscopy and X-ray photoelectron spectroscopy Smekal, Werner; Werner, Wolfgang S. M.; Powell, Cedric J. Surface and Interface Analysis, Vol. 37, Issue 11 https://doi.org/10.1002/sia.2097	journal	January 2005

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