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.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2004
- DOI:
- 10.1103/PhysRevLett.92.166401
- arXiv:
- arXiv:cond-mat/0401275
- Bibcode:
- 2004PhRvL..92p6401M
- Keywords:
-
- 71.38.-k;
- 71.30.+h;
- 75.47.Gk;
- 79.60.-i;
- Polarons and electron-phonon interactions;
- Metal-insulator transitions and other electronic transitions;
- Colossal magnetoresistance;
- Photoemission and photoelectron spectra;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, 4 figures, revtex