Metallic Conductance at the Interface of Tri-color Titanate Superlattices

Abstract

Ultra-thin tri-color (tri-layer) titanate superlattices ([3u.c. LaTiO3/2u.c. SrTiO3/3u.c. YTiO3], u.c. = unit cells) were grown in a layer-by-layer way on single crystal TbScO3 (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 [3u.c. LaTiO3/2u.c. SrTiO3] bi-layers and all the tri-color structures, whereas a [3u.c. YTiO3/2u.c. SrTiO3] bi-layer shows insulating behavior. Considering that in the bulk YTiO3 is ferromagnetic below 30 K, the tri-color titanate superlattices provide an opportunity to induce tunable spin- polarization into the two-dimensional electron gas (2DEG) with Mott carriers.

12 pages, 3figures, 1 table

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Cited by in corpus (9)

• Emergent properties hidden in plane view: Strong electronic correlations at oxide interfaces
• Engineered Mott ground state in LaTiO${}_{3+\delta }$/LaNiO${}_3$ heterostructure
• Electronic reconstruction at the isopolar LaTiO3/LaFeO3 interface: An x-ray photoemission and density functional theory study
• Magnetic interactions at the nanoscale in trilayer titanates LaTiO${}_3$/SrTiO${}_3$/YTiO${}_3$
• Evolution of ferromagnetism in two-dimensional electron gas of LaTiO3/SrTiO3
• Magnetism and electronic structure of YTiO${}_3$ thin films
• Metallic interface in non-SrTiO3 based titanate superlattice
• Emergent antiferromagnetism of YTiO3 in YTiO3-CaTiO3 superlattices
• Magnetoresistance in Metallic Ferroelectrics