Delta-doped LaAlO3/SrTiO3 interfaces

The quasi-two-dimensional electron gases formed at the interface between insulators such as SrTiO3/LaAlO3 are predicted to arise from an interfacial electronic reconstruction, but the extent to which oxygen vacancies within the substrate contribute to the conduction remains unclear. We show that delta-doping the interface with transition metal cations dramatically alters the properties and supports the model of a highly two-dimensional charge sheet.

[1]  S. Ogale,et al.  Magnetism and anomalous Hall effect in Co − ( La , Sr ) Ti O 3 , 2007 .

[2]  E. Tsymbal,et al.  Quantum nature of two-dimensional electron gas confinement at LaAlO3/SrTiO3 interfaces. , 2009, Physical review letters.

[3]  Masashi Kawasaki,et al.  Anomalous Hall effect governed by electron doping in a room-temperature transparent ferromagnetic semiconductor , 2004, Nature materials.

[4]  S. Chambers.  Ferromagnetism in doped thin-film oxide and nitride semiconductors and dielectrics , 2006 .

[5]  K. Bouzehouane,et al.  Mapping the spatial distribution of charge carriers in LaAlO3/SrTiO3 heterostructures. , 2007, Nature materials.

[6]  Akira Ohtomo,et al.  A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface , 2004, Nature.

[7]  A. Fert,et al.  High mobility in LaAlO3/SrTiO3 heterostructures: origin, dimensionality, and perspectives. , 2007, Physical review letters.

[8]  A. Hamzić,et al.  Controlling high-mobility conduction in SrTiO3 by oxide thin film deposition , 2009 .

[9]  S. Das Sarma,et al.  Quasi-two-dimensional diluted magnetic semiconductor systems. , 2005, Physical review letters.

[10]  D. Norton,et al.  Magnetic and Structural Studies in Co- and Mn-implanted SrTiO3 Single Crystals , 2008 .

[11]  J. Mannhart,et al.  Tunable Quasi-Two-Dimensional Electron Gases in Oxide Heterostructures , 2006, Science.

[12]  P. Vilarinho,et al.  (Sr,Mn)TiO3: a magnetoelectric multiglass. , 2008, Physical review letters.

[13]  U Zeitler,et al.  Magnetic effects at the interface between non-magnetic oxides. , 2007, Nature materials.

[14]  J. Verbeeck,et al.  Nanoscale analysis of interfaces in a metal/oxide/oxide trilayer obtained by pulsed laser deposition , 2007 .

[15]  S. Pearton,et al.  Magnetic properties of Co- and Mn-implanted BaTiO3, SrTiO3 and KTaO3 , 2003 .

[16]  N. Reyren,et al.  Superconducting Interfaces Between Insulating Oxides , 2007, Science.

[17]  S. Ogale,et al.  Co-occurrence of superparamagnetism and anomalous hall effect in highly reduced cobalt-doped rutile TiO2-delta films. , 2004, Physical review letters.

[18]  K. Bouzehouane,et al.  High quality SrTiO3 tunnel barrier obtained by pulsed laser deposition , 2007 .

[19]  W. Pickett,et al.  Charge localization or itineracy at LaAlO3/SrTiO3 interfaces: Hole polarons, oxygen vacancies, and mobile electrons , 2006 .

[20]  Y. P. Lee,et al.  Realization of Room‐Temperature Ferromagnetism and of Improved Carrier Mobility in Mn‐Doped ZnO Film by Oxygen Deficiency, Introduced by Hydrogen and Heat Treatments , 2007 .