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Simultaneous Spectroscopic, Diffraction and Microscopic Study of the Metal-Insulator Transition of VO2

Published online by Cambridge University Press:  21 May 2015

J. Laverock ,
S. Kittiwatanakul ,
A. A. Zakharov ,
Y. R. Niu ,
B. Chen ,
J. Kuyyalil ,
S. A. Wolf ,
J. W. Lu  and
K. E. Smith
J. Laverock
Affiliation:
Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, U.S.A.
S. Kittiwatanakul
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22904, U.S.A.
A. A. Zakharov
Affiliation:
MAX-lab, Lund University, SE-221 00 Lund, Sweden
Y. R. Niu
Affiliation:
MAX-lab, Lund University, SE-221 00 Lund, Sweden
B. Chen
Affiliation:
Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, U.S.A.
J. Kuyyalil
Affiliation:
Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, U.S.A.
S. A. Wolf
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22904, U.S.A. Department of Physics, University of Virginia, Charlottesville, VA 22904, U.S.A.
J. W. Lu
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22904, U.S.A.
K. E. Smith
Affiliation:
Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, U.S.A. School of Chemical Sciences and The MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Auckland, Auckland 1142, New Zealand
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Abstract

We present a simultaneous photoemission spectroscopic, low-energy electron diffraction and low-energy electron microscopic study of the metal-insulator transition of strained VO2. The fraction of rutile structure is extracted from the microscopic measurements throughout the transition, and compared with the fraction of the metallic electrons from photoemission data. We find that at intermediate temperatures, while the system is predominantly monoclinic-like in structure, the electronic component of the transition is much further advanced. Our results provide direct evidence for a monoclinic-like metallic phase of VO2 that is easily accessible at ambient temperatures and pressures.

Keywords

metal-insulator transitionx-ray photoelectron spectroscopy (XPS)electronic structure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1730: Symposium N – Frontiers in Complex Oxides , 2015 , mrsf14-1730-n05-04
Copyright
Copyright © Materials Research Society 2015 

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