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Title: Evidence for strong electron-lattice coupling in La{sub 2-x}Sr{sub x}NiO{sub 4}

Abstract

The inelastic neutron scattering spectra were measured for several Sr concentrations of polycrystalline La{sub 2-x}Sr{sub x}NiO{sub 4}. We find that the generalized phonon density-of-states is identical for x=0 and x=1/8. For x=1/3 and x=1/2, the band of phonons corresponding to the in-plane oxygen vibrations (>65 meV) splits into two subbands centered at 75 meV and 85 meV. The lower frequency band increases in amplitude for the x=1/2 sample, indicating that it is directly related to the hole concentration. These changes are associated with the coupling of oxygen vibrations to doped holes which reside in the NiO{sub 2} planes and are a signature of strong electron-lattice coupling. Comparison of La{sub 1.9}Sr{sub 0.1}CuO{sub 4} and La{sub 1.875}Sr{sub 0.125}NiO{sub 4} demonstrates that much stronger electron-lattice coupling occurs for particular modes in the cuprate for modest doping and is likely related to the metallic nature of the cuprate. (c) 1999 American Institute of Physics.

Authors:
 [1];  [2]
  1. Lujan Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216668
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 483; Journal Issue: 1; Other Information: PBD: 1 Sep 1999; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; LANTHANUM OXIDES; STRONTIUM OXIDES; NICKEL OXIDES; NEUTRON DIFFRACTION; ELECTRON-PHONON COUPLING; LATTICE VIBRATIONS; EXPERIMENTAL DATA

Citation Formats

McQueeney, R. J., and Sarrao, J. S. Evidence for strong electron-lattice coupling in La{sub 2-x}Sr{sub x}NiO{sub 4}. United States: N. p., 1999. Web. doi:10.1063/1.59627.
McQueeney, R. J., & Sarrao, J. S. Evidence for strong electron-lattice coupling in La{sub 2-x}Sr{sub x}NiO{sub 4}. United States. doi:10.1063/1.59627.
McQueeney, R. J., and Sarrao, J. S. Wed . "Evidence for strong electron-lattice coupling in La{sub 2-x}Sr{sub x}NiO{sub 4}". United States. doi:10.1063/1.59627.
@article{osti_20216668,
title = {Evidence for strong electron-lattice coupling in La{sub 2-x}Sr{sub x}NiO{sub 4}},
author = {McQueeney, R. J. and Sarrao, J. S.},
abstractNote = {The inelastic neutron scattering spectra were measured for several Sr concentrations of polycrystalline La{sub 2-x}Sr{sub x}NiO{sub 4}. We find that the generalized phonon density-of-states is identical for x=0 and x=1/8. For x=1/3 and x=1/2, the band of phonons corresponding to the in-plane oxygen vibrations (>65 meV) splits into two subbands centered at 75 meV and 85 meV. The lower frequency band increases in amplitude for the x=1/2 sample, indicating that it is directly related to the hole concentration. These changes are associated with the coupling of oxygen vibrations to doped holes which reside in the NiO{sub 2} planes and are a signature of strong electron-lattice coupling. Comparison of La{sub 1.9}Sr{sub 0.1}CuO{sub 4} and La{sub 1.875}Sr{sub 0.125}NiO{sub 4} demonstrates that much stronger electron-lattice coupling occurs for particular modes in the cuprate for modest doping and is likely related to the metallic nature of the cuprate. (c) 1999 American Institute of Physics.},
doi = {10.1063/1.59627},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 483,
place = {United States},
year = {1999},
month = {9}
}