Physics – Condensed Matter – Materials Science
Scientific paper
2004-07-01
Phys Rev Lett, 95, 106401 (2005).
Physics
Condensed Matter
Materials Science
5 pages, 5 figures (1 with 2 parts) -- v2. new data added (updated figures); discussion expanded
Scientific paper
10.1142/S0217979205028979
We present extensive X-ray Absorption Fine Structure (XAFS) measurements on La_{1-x}Ca_xMnO_3 as a function of B-field (to 11T) and Ca concentration, x (21-45%). These results reveal local structure changes (associated with polaron formation) that depend only on the magnetization for a given sample, irrespective of whether the magnetization is achieved through a decrease in temperature or an applied magnetic field. Furthermore, the relationship between local structure and magnetization depends on the hole doping. A model is proposed in which a filamentary magnetization initially develops via the aggregation of pairs of Mn atoms involving a hole and an electron site. These pairs have little distortion and it is likely that they pre-form at temperatures above T_c.
Bridges F.
Bushart S.
Dilley N.
Downward L.
Neumeier John J.
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