Intrinsic Nanoscale Inhomogeneities in Transition Metal Oxides

Details Intrinsic Nanoscale Inhomogeneities in Transition Metal Oxides Intrinsic Nanoscale Inhomogeneities in Transition Metal Oxides

2006-12-29

arxiv.org/abs/cond-mat/0701001v1

Phys. Rev. B76, 014437 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 7 figures, submitted to Phys. Rev. B

Scientific paper

Neutron elastic, inelastic and high energy x-ray scattering techniques are used to explore the nature of the polaron order and dynamics in La0.7Ca0.3MnO3. Static polaron correlations develop within a narrow temperature regime as the Curie temperature is approached from low temperatures, with a nanoscale correlation length that is only weakly temperature dependent. The static nature of these short-range polaron correlations indicates the presence of a glass-like state, similar to the observations for the bilayer manganite in the metallic-ferromagnetic doping region. In addition to this elastic component, inelastic scattering measurements reveal dynamic correlations with a comparable correlation length, and with an energy distribution that is quasielastic. The elastic component disappears at a higher temperature T*, above which the correlations are purely dynamic. The overall behavior bears a remarkable resemblance to the magnetic fluctuation spectrum recently observed in underdoped cuprates.

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