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