title: Direct observation of high-temperature polaronic behavior in colossal magnetoresistive manganites.
abstract: The temperature dependence of the electronic and atomic structure of the colossal magnetoresistive oxides La1-xSrxMnO3 (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 on 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.
authors.affiliation: Department of Physics, UC Davis, Davis, California 95616, USA. norman@electron.lbl.gov
authors.forename: N
authors.initials: N
authors.lastname: Mannella
authors.forename: A
authors.initials: A
authors.lastname: Rosenhahn
authors.forename: C H
authors.initials: CH
authors.lastname: Booth
authors.forename: S
authors.initials: S
authors.lastname: Marchesini
authors.forename: B S
authors.initials: BS
authors.lastname: Mun
authors.forename: S-H
authors.initials: SH
authors.lastname: Yang
authors.forename: K
authors.initials: K
authors.lastname: Ibrahim
authors.forename: Y
authors.initials: Y
authors.lastname: Tomioka
authors.forename: C S
authors.initials: CS
authors.lastname: Fadley