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Title: LEED and photoemission study of the stability of VO{sub 2} surfaces

Abstract

We present low-energy electron-diffraction (LEED) and photoemission measurements of single-crystal surfaces of VO{sub 2}, made possible using samples oriented and characterized {ital in situ}. LEED shows that the (100) surface has a (1{times}2) reconstruction, but the (110) and (101) surfaces have diffraction patterns consistent with those expected from termination of the bulk. The (001) surface is evidently unstable: gentle {ital in situ} heating of our samples causes faceting, while similar heating of cleaved single crystals results in irreversible changes in photoemission spectra, which we interpret as surface relaxation of (001) facets. At the metal-insulator transition, photoemission spectra of the nearly sixfold coordinated stable (110) and (101) surfaces change greatly, but spectra of the (001) surface change only slightly. We suggest a coupling between the electronic and structural instabilities of VO{sub 2} may be responsible. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
; ; ; ; ;  [1];  [2];  [1]
  1. University of Augsburg, Memminger Strasse 6, 86159 Augsburg (Germany)
  2. Hunter College of the City University of New York, New York, New York 10021 (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
OSTI Identifier:
450420
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 55; Journal Issue: 7; Other Information: PBD: Feb 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; VANADIUM OXIDES; PHOTOEMISSION; ELECTRON DIFFRACTION; SURFACE PROPERTIES; PHASE TRANSFORMATIONS; ELECTRONIC STRUCTURE; CRYSTAL STRUCTURE; ULTRAVIOLET RADIATION; metal-insulator transition

Citation Formats

Goering, E, Schramme, M, Mueller, O, Barth, R, Paulin, H, Klemm, M, denBoer, M L, and Horn, S. LEED and photoemission study of the stability of VO{sub 2} surfaces. United States: N. p., 1997. Web. doi:10.1103/PhysRevB.55.4225.
Goering, E, Schramme, M, Mueller, O, Barth, R, Paulin, H, Klemm, M, denBoer, M L, & Horn, S. LEED and photoemission study of the stability of VO{sub 2} surfaces. United States. https://doi.org/10.1103/PhysRevB.55.4225
Goering, E, Schramme, M, Mueller, O, Barth, R, Paulin, H, Klemm, M, denBoer, M L, and Horn, S. 1997. "LEED and photoemission study of the stability of VO{sub 2} surfaces". United States. https://doi.org/10.1103/PhysRevB.55.4225.
@article{osti_450420,
title = {LEED and photoemission study of the stability of VO{sub 2} surfaces},
author = {Goering, E and Schramme, M and Mueller, O and Barth, R and Paulin, H and Klemm, M and denBoer, M L and Horn, S},
abstractNote = {We present low-energy electron-diffraction (LEED) and photoemission measurements of single-crystal surfaces of VO{sub 2}, made possible using samples oriented and characterized {ital in situ}. LEED shows that the (100) surface has a (1{times}2) reconstruction, but the (110) and (101) surfaces have diffraction patterns consistent with those expected from termination of the bulk. The (001) surface is evidently unstable: gentle {ital in situ} heating of our samples causes faceting, while similar heating of cleaved single crystals results in irreversible changes in photoemission spectra, which we interpret as surface relaxation of (001) facets. At the metal-insulator transition, photoemission spectra of the nearly sixfold coordinated stable (110) and (101) surfaces change greatly, but spectra of the (001) surface change only slightly. We suggest a coupling between the electronic and structural instabilities of VO{sub 2} may be responsible. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.55.4225},
url = {https://www.osti.gov/biblio/450420}, journal = {Physical Review, B: Condensed Matter},
number = 7,
volume = 55,
place = {United States},
year = {Sat Feb 01 00:00:00 EST 1997},
month = {Sat Feb 01 00:00:00 EST 1997}
}