Versatile Tunability of the Metal Insulator Transition in (TiO2)m/(VO2)mSuperlattices

被引:9
作者
Eres, Gyula [1 ]
Lee, Shinbuhm [1 ,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 ]
机构
[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[2] Daegu Gyeongbuk Inst Sci & Technol, Dept Emerging Mat Sci, Daegu 42988, South Korea
[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[4] Paul Scherrer Inst, Photon Sci Div, CH-5232 Villigen, Switzerland
基金
瑞士国家科学基金会;
关键词
binary oxide superlattices; metal insulator transitions; pulsed laser deposition; strongly correlated oxides; X-ray spectroscopy; X-RAY-SCATTERING; SWISS LIGHT-SOURCE; POLARIZATION DEPENDENCE; VANADIUM DIOXIDE; TIO2; 001; VO2; ABSORPTION; RESOLUTION; METALLIZATION; BEAMLINE;
D O I
10.1002/adfm.202004914
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 (TiO2)(m)/(VO2)(m)/TiO2(001) superlattices withm = 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 VL3,2-edge and resonant inelastic X-ray scattering (RIXS) at the Ti and VL3-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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页数:11
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