Phonon densities of states of La{sub 2{minus}x}Sr{sub x}NiO{sub 4}: Evidence for strong electron-lattice coupling

Journal Article · Thu Jul 01 00:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.80· OSTI ID:351883

McQueeney, R J; Sarrao, J L ^[1]; Osborn, R ^[2]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

The inelastic neutron-scattering spectra were measured for several Sr concentrations of polycrystalline La{sub 2{minus}x}Sr{sub x}NiO{sub 4}. We find that the generalized phonon density-of-states is the same 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 (80{endash}90 meV) splits into two subbands centered at 75 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. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 351883
• Journal Information: Physical Review, B: Condensed Matter, Vol. 60, Issue 1; Other Information: PBD: Jul 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LANTHANUM COMPOUNDS
STRONTIUM COMPOUNDS
ANTIFERROMAGNETIC MATERIALS
HIGH-TC SUPERCONDUCTORS
ELECTRON-PHONON COUPLING
LANTHANUM OXIDES
NICKEL OXIDES
STRONTIUM OXIDES
ENERGY-LEVEL DENSITY
HOLES
NEUTRON DIFFRACTION
PHONONS
CARRIER DENSITY
OXYGEN
VIBRATIONAL STATES
INELASTIC SCATTERING