We report x-ray scattering studies of nanoscale structural correlations in (formula presented) and (formula presented) (formula presented) We find that the correlated regions possess a temperature-independent correlation length of 2-3 lattice constants which is the same in all samples. The period of the lattice modulation of the correlated regions is proportional to the Ca/Sr doping concentration x. Remarkably, the lattice modulation periods of these and several other manganites with a ferromagnetic ground state fall on the same curve when plotted as a function of x. Thus, the structure of the correlated regions in these materials appears to be determined by a single parameter x. We argue that these observations provide important clues for understanding the colossal magnetoresistance phenomenon in manganites.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2002|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics