Abstract
Local lattice distortions suggesting nonuniform charge distributions were found to be a common feature of manganites and cuprates in the metallic state by neutron scattering studies. The atomic pair-density function (PDF) determined by pulsed neutron powder diffraction showed that in La1-xSrxMnO3 doped holes form lattice polarons which persist even in the metallic state. In La1.85Sr0.15CuO4 the energy width of the LO phonons around (π,0) determined by inelastic neutron scattering reflects magnetic satellites indicative of spin charge stripe formation. The implications of such nonuniform charge distribution for metal-insulator transition and superconductivity are discussed.
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Note added to proof: A more recent measurement, however, revealed intriguing details of this anomaly in terms of the split dispersion rather than the increase in the energy width. These will be reported elsewhere.
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Egami, T., Louca, D. & McQueeney, R.J. Nonuniform metallic state in manganites and cuprates. J Supercond 10, 323–327 (1997). https://doi.org/10.1007/BF02765712
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DOI: https://doi.org/10.1007/BF02765712