Glass transition in the polaron dynamics of colossal magnetoresistive manganites |
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Authors: | Argyriou D N Lynn J W Osborn R Campbell B Mitchell J F Ruett U Bordallo H N Wildes A Ling C D |
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Institution: | Materials Science Division, Argonne National Laboratory, Argonne, Illinois, 60439, USA. |
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Abstract: | Neutron scattering measurements on a bilayer manganite near optimal doping show that the short-range polaron correlations are completely dynamic at high T, but then freeze upon cooling to a temperature T(*) approximately equal 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 (T(C) = 114 K), where the polarons melt, the diffuse scattering quickly develops into a propagating, transverse optic phonon. |
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