Versatile Tunability of the Metal Insulator Transition in (TiO 2 ) m /(VO 2 ) m Superlattices

Eres, Gyula; Lee, Shinbuhm; Nichols, John; Sohn, Changhee; Ok, Jong Mok; Mazza, Alessandro R.; Liu, Chenze; Duscher, Gerd; Lee, Ho Nyung; McNally, Daniel E.; Lu, Xingye; Radovic, Milan; Schmitt, Thorsten

doi:10.1002/adfm.202004914

Title: Versatile Tunability of the Metal Insulator Transition in (TiO 2 ) m /(VO 2 ) m Superlattices

Journal Article · Sun Sep 20 00:00:00 EDT 2020 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.202004914· OSTI ID:1664492

^[1]; Lee, Shinbuhm ^[2]; Nichols, John ^[1]; Sohn, Changhee ^[1]; Ok, Jong Mok ^[1]; Mazza, Alessandro R. ^[1]; Liu, Chenze ^[3]; Duscher, Gerd ^[3]; Lee, Ho Nyung ^[1]; McNally, Daniel E. ^[4]; Lu, Xingye ^[4]; Radovic, Milan ^[4]; Schmitt, Thorsten ^[4]

Oak Ridge National Laboratory Materials Science and Technology Division Oak Ridge TN 37831 USA
Oak Ridge National Laboratory Materials Science and Technology Division Oak Ridge TN 37831 USA;Department of Emerging Materials Science Daegu‐Gyeongbuk Institute of Science and Technology Daegu 42988 Republic of Korea
Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA
Paul Scherrer Institut Photon Science Division Villigen PSI CH‐5232 Switzerland

Abstract In contrast to perovskites that share only common corners of cation‐occupied octahedra, binary‐oxides in addition share edges and faces increasing the versatility for tuning the properties and functionality of reduced dimensionality systems of strongly correlated oxides. This approach for tuning the electronic structure is based on the ability of X‐ray spectroscopy methods to monitor the creation and transformation of occupied and unoccupied electronic states produced by interface coupling and lattice distortions. X‐ray diffraction reveals a new range of structural metastability in (TiO ₂ ) _m /(VO ₂ ) _m /TiO ₂ (001) superlattices with m = 1, 3, 5, 20, 40, and electrical transport measurements show metal insulator transition (MIT) behavior typically associated with presence of high oxygen vacancy concentrations. However, X‐ray absorption spectroscopy (XAS) at the Ti and V L _3,2 ‐edge and resonant inelastic X‐ray scattering (RIXS) at the Ti and V L ₃ ‐edge show no excitations characteristic of oxygen vacancy induced valance change in V and negligible intensities in Ti RIXS. The unexpected absence of oxygen vacancy related states in the X‐ray spectroscopy data suggests that superlattice fabrication is capable of suppressing oxygen vacancy formation while still affording a wide tunability range of the MIT. Achieving a wide range of MIT tunability while reducing or eliminating oxygen vacancies that are detrimental to electrical properties is highly desirable for technological applications of strongly correlated oxides.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNSF); European Commission (EC); USDOE

Grant/Contract Number:: AC05-00OR22725; CRSII2_160765/1; CRSII2_141962; FP7/20072013; 290605; 200021_178867; 200021_182695

OSTI ID:: 1664492

Alternate ID(s):: OSTI ID: 1770648; OSTI ID: 1785853

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 30 Journal Issue: 51; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: Germany

Language:: English

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