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Title: Metallic conductance at the interface of tri-color titanate superlattices

Ultra-thin tri-color (tri-layer) titanate superlattices ([3 u.c. LaTiO{sub 3}/2 u.c. SrTiO{sub 3}/3 u.c. YTiO{sub 3}], u.c. = unit cells) were grown in a layer-by-layer way on single crystal TbScO{sub 3} (110) substrates by pulsed laser deposition. High sample quality and electronic structure were characterized by the combination of in-situ photoelectron and ex-situ structure and surface morphology probes. Temperature-dependent sheet resistance indicates the presence of metallic interfaces in both [3 u.c. LaTiO{sub 3}/2 u.c. SrTiO{sub 3}] bi-layers and all the tri-color structures, whereas a [3 u.c. YTiO{sub 3}/2 u.c. SrTiO{sub 3}] bi-layer shows insulating behavior. Considering that in the bulk YTiO{sub 3} is ferromagnetic below 30 K, the tri-color titanate superlattices provide an opportunity to induce tunable spin-polarization into the two-dimensional electron gas with Mott carriers.
Authors:
; ; ; ; ;  [1]
  1. Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701 (United States)
Publication Date:
OSTI Identifier:
22253873
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COLOR; ELECTRON GAS; ELECTRONIC STRUCTURE; ENERGY BEAM DEPOSITION; INTERFACES; LANTHANUM COMPOUNDS; LASER RADIATION; LAYERS; MONOCRYSTALS; MORPHOLOGY; PULSED IRRADIATION; SPIN ORIENTATION; STRONTIUM TITANATES; SUBSTRATES; SUPERLATTICES; TEMPERATURE DEPENDENCE