Limited local electron-lattice coupling in manganites

Details Limited local electron-lattice coupling in manganites Limited local electron-lattice coupling in manganites

2008-01-30

arxiv.org/abs/0801.4626v1

Phys. Rev. B 77, 092411 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 4 figures; accepted in Physical Review B

Scientific paper

10.1103/PhysRevB.77.092411

(Pr,Ca)MnO3 is the archetypal charge-ordered manganite, but in Pr0.48Ca0.52MnO3 we find (using convergent-beam electron diffraction and dark-field images) that the superlattice period is locally incommensurate with respect to the parent lattice, and that the superlattice orientation possesses significant local variations. This suggests that local electron-lattice coupling never overwhelmingly dominates the rich physics of manganites, even in the most extreme scenarios that produce the largest colossal magnetoresistance effects.

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