skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Raman scattering from epitaxial HfN layers grown on MgO(001)

Abstract

Stoichiometric single-crystal HfN layers grown on MgO(001) are analyzed by Raman spectroscopy. Second-order Raman scattering predominates, but first-order modes in the acoustic and optical ranges are also visible. The latter indicates that the O{sub h} symmetry of NaCl-structure HfN is broken. The large mass difference between Hf and N leads to a correspondingly large separation, 250 cm{sup -1}, between the first-order acoustic and optical bands. Within this gap, four Raman lines are clearly observed. The first three are the second-order transverse acoustic mode (240 cm{sup -1}), the sum of the first-order transverse and longitudinal acoustic modes (280 cm{sup -1}), and the second-order longitudinal acoustic mode (325 cm{sup -1}). The fourth line at 380 cm{sup -1} is identified as the difference between the first-order optical and acoustic modes. The observed first-order Raman scattering, as well as the width of the gap between the first-order acoustic and optical modes, is in good agreement with previously calculated HfN phonon density of states.

Authors:
; ; ;  [1];  [2]
  1. Department of Materials Science and the Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801 and Institut Universitaire de Technologie, Universite de Haute Alsace, 68093 Mulhouse Cedex (France)
  2. (United States)
Publication Date:
OSTI Identifier:
20787881
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 99; Journal Issue: 4; Other Information: DOI: 10.1063/1.2173037; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; EPITAXY; HAFNIUM NITRIDES; LAYERS; MAGNESIUM OXIDES; MASS DIFFERENCE; MONOCRYSTALS; OPTICAL MODES; PHONONS; RAMAN EFFECT; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SODIUM CHLORIDES; STOICHIOMETRY; SYMMETRY

Citation Formats

Stoehr, M., Seo, H.-S., Petrov, I., Greene, J.E., and Department of Materials Science and the Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801. Raman scattering from epitaxial HfN layers grown on MgO(001). United States: N. p., 2006. Web. doi:10.1063/1.2173037.
Stoehr, M., Seo, H.-S., Petrov, I., Greene, J.E., & Department of Materials Science and the Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801. Raman scattering from epitaxial HfN layers grown on MgO(001). United States. doi:10.1063/1.2173037.
Stoehr, M., Seo, H.-S., Petrov, I., Greene, J.E., and Department of Materials Science and the Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801. Wed . "Raman scattering from epitaxial HfN layers grown on MgO(001)". United States. doi:10.1063/1.2173037.
@article{osti_20787881,
title = {Raman scattering from epitaxial HfN layers grown on MgO(001)},
author = {Stoehr, M. and Seo, H.-S. and Petrov, I. and Greene, J.E. and Department of Materials Science and the Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801},
abstractNote = {Stoichiometric single-crystal HfN layers grown on MgO(001) are analyzed by Raman spectroscopy. Second-order Raman scattering predominates, but first-order modes in the acoustic and optical ranges are also visible. The latter indicates that the O{sub h} symmetry of NaCl-structure HfN is broken. The large mass difference between Hf and N leads to a correspondingly large separation, 250 cm{sup -1}, between the first-order acoustic and optical bands. Within this gap, four Raman lines are clearly observed. The first three are the second-order transverse acoustic mode (240 cm{sup -1}), the sum of the first-order transverse and longitudinal acoustic modes (280 cm{sup -1}), and the second-order longitudinal acoustic mode (325 cm{sup -1}). The fourth line at 380 cm{sup -1} is identified as the difference between the first-order optical and acoustic modes. The observed first-order Raman scattering, as well as the width of the gap between the first-order acoustic and optical modes, is in good agreement with previously calculated HfN phonon density of states.},
doi = {10.1063/1.2173037},
journal = {Journal of Applied Physics},
number = 4,
volume = 99,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}