2003/06/26 by I. Martin, Ivar Martin, R. J. McQueeney +7
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Gas Sensing Nanomaterials and Sensors #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optical and Acousto-Optic Technologies #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0306672
4 pages
arxiv created 2003/06/26 · openalex publication_date 2003/06/26 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
By applying an unrestriced Hartree-Fock approximation and a Random Phase approximation to multiband Peierls-Hubbard Hamiltonians, we determine 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 interface between regions of distinct electronic structure and separated in frequency from the band of extended phonons. A major characteristic of these ``edge'' modes is that their energy is essentially insensitive to the doping level, while their intensity increases with the density of interfaces (and thus doping level). We argue that the presence of such modes is a typical feature of systems with phase separation, including cuprates, nickelates, manganites, and bismuthates. We specifically address the experimental signatures of these modes in lattice inelastic neutron scattering.