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

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The inelastic neutron scattering spectra were measured for several Sr concentrations of polycrystalline La{sub 2{minus}x}Sr{sub x}NiO{sub 4}. The authors 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 ... continued below

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7 p.

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McQueeney, R.J. & Sarrao, J.L. April 1, 1999.

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Description

The inelastic neutron scattering spectra were measured for several Sr concentrations of polycrystalline La{sub 2{minus}x}Sr{sub x}NiO{sub 4}. The authors 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.

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7 p.

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INIS; OSTI as DE99002183

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  • High temperature superconductivity conference, Miami, FL (United States), 7-13 Jan 1999

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  • Other: DE99002183
  • Report No.: LA-UR--99-644
  • Report No.: CONF-990116--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/334199 | External Link
  • Office of Scientific & Technical Information Report Number: 334199
  • Archival Resource Key: ark:/67531/metadc686431

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  • April 1, 1999

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:29 p.m.

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McQueeney, R.J. & Sarrao, J.L. Evidence for strong electron-lattice coupling in La{sub 2{minus}x}Sr{sub x}NiO{sub 4}, report, April 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc686431/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.