Volume 82, Number 4, May 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 May 2008|
Theory of the unusual doping and temperature dependence of photoemission spectra in manganites
Centre for Condensed Matter Theory (CCMT), Department of Physics, Indian Institute of Science Bangalore 560012, India
2 Harishchandra Research Institute - Allahabad 211019, India
3 Department of Physics and Astronomy, University of British Columbia - 6224, Agricultural Road, Vancouver, BC V6T 1Z1, Canada
4 Solid State and Structural Chemistry Unit, Indian Institute of Science - Bangalore 560012, India
5 Jawaharlal Nehru Centre for Advanced Scientific Research - Bangalore 560064, India
6 Center for Advanced Materials, Indian Association for Cultivation of Science - Kolkata 700032, India
7 Department of Physics, Banaras Hindu University - Varanasi 221005, India
Corresponding author: email@example.com
Accepted: 6 April 2008
A recent, major, puzzle in the core-level photoemission spectra of doped manganites is the observation of a 12 eV wide shoulder with intensity varying with temperature T as the square of the magnetization over a T scale of order 200 K, an order of magnitude less than electronic energies. This is addressed and resolved here, by extending a recently proposed two-fluid polaronmobile electron model for these systems to include core-hole effects. The position of the shoulder is found to be determined by Coulomb and Jahn-Teller energies, while its spectral weight is determined by the mobile electron energetics which is strongly T and doping dependent, due to annealed disorder scattering from the polarons and the t core spins. Our theory accounts quantitatively for the observed T dependence of the difference spectra, and furthermore, explains the observed correspondence between spectral changes due to increasing doping and decreasing T.
PACS: 75.47.Lx – Manganites / 79.60.-i – Photoemission and photoelectron spectra / 71.10.-w – Theories and models of many-electron systems
© EPLA, 2008
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