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Phys. Rev. Lett. 92, 166401 (2004) [4 pages]

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

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N. Mannella1,2,*, A. Rosenhahn2, C. H. Booth3, S. Marchesini2, B. S. Mun1,2, S.-H. Yang2, K. Ibrahim2,4, Y. Tomioka5, and C. S. Fadley1,2
1Department of Physics, UC Davis, Davis, California, USA 95616, USA
2Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
4Beijing Synchrotron Radiation Laboratory, Beijing, China
5Correlated Electron Research Center, Tsukuba, Japan

Received 19 July 2003; published 20 April 2004

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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.166401
DOI:
10.1103/PhysRevLett.92.166401
PACS:
71.38.–k, 71.30.+h, 75.47.Gk, 79.60.–i

*Author to whom correspondence should be addressed.

Electronic address: norman@electron.lbl.gov

 
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