2001/12/05 by V. Kiryukhin, T. Y. Koo, A. Borissov +6 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat
paper · pdf · doi:10.1103/physrevb.65.094421
6 pages, 5 embedded eps figures
arxiv created 2001/12/05 · openalex publication_date 2002/02/14 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report x-ray scattering studies of nanoscale structural correlations in Nd_1\ensuremath-xSrxMnO3 and La_1\ensuremath-x(Ca,Sr)xMnO3, x=0.2--0.5. 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.