Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-19
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures; minor changes in the text and figures;
Scientific paper
The experimental Mn K-edge x-ray absorption spectra of La$_{1-x}$Sr$_x$MnO$_{3}$, $x$ = 0 - 0.7 are compared with the band structure calculations using spin polarized density functional theory. It is explicitly shown that there is a correspondence between the inflection point on the absorption edge and the centre of gravity of the unoccupied Mn 4$p$-band. This correspondence has been used to separate the doping and size contributions to edge shift due to variation in number of electrons in valence band and Mn-O bond lengths, respectively when Sr is doped into LaMnO$_3$. Such separation is helpful to find the localization behaviour of charge carriers and to understand the observed transport properties of these compounds.
Bindu R.
Khalid Samina
Kumar Ashwani
Pandey Sudhir K.
Pimpale A. V.
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