Direct Observation of High-Temperature Polaronic Behavior In Colossal Magnetoresistive Manganites

Details Direct Observation of High-Temperature Polaronic Behavior In Colossal Magnetoresistive Manganites Direct Observation of High-Temperature Polaronic Behavior In Colossal Magnetoresistive Manganites

2004-01-15

arxiv.org/abs/cond-mat/0401275v2

Phys. Rev. Lett. 92, 166401 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, revtex

Scientific paper

10.1103/PhysRevLett.92.166401

The temperature dependence of the electronic and atomic structure of the colossal magnetoresistive oxides $La_{1-x}Sr_{x}MnO_{3}$ (x = 0.3, 0.4) has been studied using core and valence level photoemission, x-ray absorption and emission, and extended x-ray absorption fine structure spectroscopy. A dramatic and reversible change of the electronic structure is observed on crossing the Curie temperature, including charge localization and spin moment increase of Mn, together with Jahn-Teller distortions, both signatures of polaron formation. Our data are also consistent with a phase-separation scenario.

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