In situ Study on the Evolution of Atomic and Electronic Structure of LaTiO3/SrTiO3 System

Hong, Hawoong; McChesney, Jessica L.; Wrobel, Friederike; Yan, Xi; Li, Yan; Bhattacharya, Anand; Fong, Dillon D.

doi:10.1103/physrevmaterials.6.l011401

Title: In situ Study on the Evolution of Atomic and Electronic Structure of LaTiO₃/SrTiO₃ System

Journal Article · Fri Jan 14 00:00:00 EST 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.l011401· OSTI ID:1894244

^[1]; McChesney, Jessica L. ^[1]; Wrobel, Friederike ^[2];

^[2];

^[3]; Bhattacharya, Anand ^[2]; Fong, Dillon D. ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)

As with other transition-metal oxide interfaces, LaTiO₃/SrTiO₃ interfaces exhibit interesting electronic properties, such as a two-dimensional electron gas. While the available Mott states and multiple pathways to metallicity in LaTiO₃ can lead to a variety of applications in oxide electronics, the origin of the different properties remains uncertain. Herein, utilizing real-time, in situ x-ray diffraction at the synchrotron, robust but thin LaTiO₃/SrTiO₃ heterostructures were fabricated using oxide molecular beam epitaxy. A thickness of six unit cells was determined to be critical, at which point the LaTiO₃/SrTiO₃ heterostructures begin to sustain sharp, well-defined interfaces. The layers of LaTiO₃ and SrTiO₃ were sufficiently thin to benefit from the finite escape length of electrons at resonant soft x-ray photoemission, and the heterostructures were transferred in vacuo after growth to another chamber for synchrotron-based x-ray photoemission spectroscopy studies. With the x-ray energy tuned to the Ti-2p resonance, the LaTiO₃/SrTiO₃ interfaces could be probed with enough penetration depth and selectivity. It is shown that all of the heterointerfaces exhibit the two-dimensional electron gas.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1894244

Alternate ID(s):: OSTI ID: 1899202

Journal Information:: Physical Review Materials, Vol. 6, Issue 1; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: In situ Study on the Evolution of Atomic and Electronic Structure of LaTiO₃/SrTiO₃ System