Glass Transition in the Polaron Dynamics of CMR Manganites

Abstract

Neutron scattering measurements on a bilayer manganite near optimal doping show that the short-range polarons correlations are completely dynamic at high T, but then freeze upon cooling to a temperature T* 310 K. This glass transition suggests that the paramagnetic/insulating state arises from an inherent orbital frustration that inhibits the formation of a long range orbital- and charge-ordered state. Upon further cooling into the ferromagnetic-metallic state (Tc=114 K), where the polarons melt, the diffuse scattering quickly develops into a propagating, transverse optic phonon.

4 pages, 4 figures. Physical Review Letters (in Press)

References in corpus (3)

• Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
• Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
• The Structure of Nanoscale Polaron Correlations in La1.2Sr1.8Mn2O7

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