Experimental investigation of electronic properties of buried heterointerfaces of LaAlO3 on SrTiO3

W. Siemons, Gertjan Koster, Hideki Yamamoto, Theodore H. Geballe, David H.A. Blank, Malcolm R. Beasley

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Abstract

We have made very thin films of LaAlO3 on TiO2 terminated SrTiO3 and have measured the properties of the resulting interface in various ways. Transport measurements show a maximum sheet carrier density of 1016 cm−2 and a mobility around 104 cm2 V−1 s−1. In situ ultraviolet photoelectron spectroscopy (UPS) indicates that for these samples a finite density of states exists at the Fermi level. From the oxygen pressure dependence measured in both transport as well as the UPS, we detail, as reported previously by us, that oxygen vacancies play an important role in the creation of the charge carriers and that these vacancies are introduced by the pulsed laser deposition process used to make the heterointerfaces. Under the conditions studied the effect of LaAlO3 on the carrier density is found to be minimal.
Original languageUndefined
Pages (from-to)155111-
Number of pages5
JournalPhysical review B: Condensed matter and materials physics
Volume76
Issue number15
DOIs
Publication statusPublished - 2007

Keywords

  • METIS-245654
  • IR-59165

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