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Simultaneous structural and electronic transitions in epitaxial VO2/TiO2(001)

DOI: 10.1103/PhysRevLett.124.196402 DOI Help

Authors: Galo J. Paez (Binghamton University, State University of New York) , Christopher N. Singh (Binghamton University, State University of New York) , Matthew J. Wahila (Binghamton University, State University of New York) , Keith E. Tirpak (Binghamton University, State University of New York) , Nicholas F. Quackenbush (Binghamton University, State University of New York) , Shawn Sallis (Binghamton University, State University of New York) , Hanjong Paik (Cornell University) , Yufeng Liang (The Molecular Foundry, Lawrence Berkeley National Laboratory) , Darrell G. Schlom (Cornell University; Kavli Institute at Cornell for Nanoscale Science) , Tien-lin Lee (Diamond Light Source) , Christoph Schlueter (Diamond Light Source) , Wei-cheng Lee (Binghamton University, State University of New York) , Louis F. J. Piper (Binghamton University, State University of New York)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 124

State: Published (Approved)
Published: May 2020
Diamond Proposal Number(s): 13812 , 25355

Abstract: Recent reports have identified new metaphases of VO 2 with strain and/or doping, suggesting the structural phase transition and the metal-to-insulator transition might be decoupled. Using epitaxially strained VO 2 / Ti O 2 (001) thin films, which display a bulklike abrupt metal-to-insulator transition and rutile to monoclinic transition structural phase transition, we employ x-ray standing waves combined with hard x-ray photoelectron spectroscopy to simultaneously measure the structural and electronic transitions. This x-ray standing waves study elegantly demonstrates the structural and electronic transitions occur concurrently within experimental limits (±1K).

Journal Keywords: Epitaxial strain; Lattice dynamics; Peierls transition; Quantum phase transitions; Transition temperature; Mott insulators; Thin films; Density functional calculations; Hard x-ray photoelectron spectroscopy; X-ray absorption spectroscopy; X-ray standing w

Subject Areas: Physics, Materials


Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: Advanced Light Source