Metallic conductance at the interface of tri-color titanate superlattices

Journal Article · Mon Dec 02 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4841955· OSTI ID:22253873

Cao, Yanwei; Liu, Xiaoran; Middey, S.; Meyers, D.; Chakhalian, J. ^[1]

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1. Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701 (United States)

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.

• OSTI ID: 22253873
• Journal Information: Applied Physics Letters, Vol. 103, Issue 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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