Metallic conductance at the interface of tri-color titanate superlattices

M. Kareev; Yanwei Cao; Xiaoran Liu; S. Middey; D. Meyers; J. Chakhalian

doi:10.1063/1.4841955

Metallic conductance at the interface of tri-color titanate superlattices

M. Kareev, Yanwei Cao, Xiaoran Liu, S. Middey, D. Meyers, J. Chakhalian

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Ultra-thin tri-color (tri-layer) titanate superlattices ([3 u.c. LaTiO ₃/2 u.c. SrTiO₃/3 u.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 [3 u.c. LaTiO₃/2 u.c. SrTiO₃] bi-layers and all the tri-color structures, whereas a [3 u.c. YTiO₃/2 u.c. SrTiO₃] bi-layer shows insulating behavior. Considering that in the bulk YTiO 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.

Original language	English (US)
Article number	231605
Journal	Applied Physics Letters
Volume	103
Issue number	23
DOIs	https://doi.org/10.1063/1.4841955
State	Published - Dec 2 2013
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4841955

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@article{dc5f5559fd4e48fe9d491aa647d10aeb,

title = "Metallic conductance at the interface of tri-color titanate superlattices",

abstract = "Ultra-thin tri-color (tri-layer) titanate superlattices ([3 u.c. LaTiO 3/2 u.c. SrTiO3/3 u.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 [3 u.c. LaTiO3/2 u.c. SrTiO3] bi-layers and all the tri-color structures, whereas a [3 u.c. YTiO3/2 u.c. SrTiO3] bi-layer shows insulating behavior. Considering that in the bulk YTiO 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.",

author = "M. Kareev and Yanwei Cao and Xiaoran Liu and S. Middey and D. Meyers and J. Chakhalian",

note = "Funding Information: J.C. was supported by DOD-ARO Grant No. 0402-17291. We deeply acknowledge discussions with Christsos Panagopolous.",

year = "2013",

month = dec,

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doi = "10.1063/1.4841955",

language = "English (US)",

volume = "103",

journal = "Applied Physics Letters",

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T1 - Metallic conductance at the interface of tri-color titanate superlattices

AU - Kareev, M.

AU - Cao, Yanwei

AU - Liu, Xiaoran

AU - Middey, S.

AU - Meyers, D.

AU - Chakhalian, J.

N1 - Funding Information: J.C. was supported by DOD-ARO Grant No. 0402-17291. We deeply acknowledge discussions with Christsos Panagopolous.

PY - 2013/12/2

Y1 - 2013/12/2

N2 - Ultra-thin tri-color (tri-layer) titanate superlattices ([3 u.c. LaTiO 3/2 u.c. SrTiO3/3 u.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 [3 u.c. LaTiO3/2 u.c. SrTiO3] bi-layers and all the tri-color structures, whereas a [3 u.c. YTiO3/2 u.c. SrTiO3] bi-layer shows insulating behavior. Considering that in the bulk YTiO 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.

AB - Ultra-thin tri-color (tri-layer) titanate superlattices ([3 u.c. LaTiO 3/2 u.c. SrTiO3/3 u.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 [3 u.c. LaTiO3/2 u.c. SrTiO3] bi-layers and all the tri-color structures, whereas a [3 u.c. YTiO3/2 u.c. SrTiO3] bi-layer shows insulating behavior. Considering that in the bulk YTiO 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.

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ER -

Metallic conductance at the interface of tri-color titanate superlattices

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