Vibrational edge modes in intrinsically heterogeneous doped transition metal oxides

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.70.224514· OSTI ID:20662277

Martin, I; Kaneshita, E; Bishop, A R; McQueeney, R J; Yu, Z G ^[1]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

By applying an unrestricted Hartree-Fock and a random phase approximation to a multiband Peierls-Hubbard Hamiltonian, we study the phonon mode structure in models of transition metal oxides in the presence of intrinsic nanoscale inhomogeneities induced by hole doping. We identify low-frequency local vibrational modes pinned to the sharp interfaces between regions of distinct electronic structure (doped and undoped) and separated in frequency from the band of extended phonons. A characteristic of these 'edge' modes is that their energy is essentially insensitive to the doping level. We discuss the experimental manifestations of these modes in inelastic neutron scattering and also in spin and charge excitation spectra.

• OSTI ID: 20662277
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 70; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DOPED MATERIALS
ELECTRONIC STRUCTURE
EXCITATION
HAMILTONIANS
HARTREE-FOCK METHOD
HIGH-TC SUPERCONDUCTORS
INELASTIC SCATTERING
INTERFACES
NANOSTRUCTURES
NEUTRON DIFFRACTION
NEUTRON SPECTRA
OXIDES
PHONONS
RANDOM PHASE APPROXIMATION
TRANSITION ELEMENT COMPOUNDS