Common features of nanoscale structural correlations in magnetoresistive manganites with ferromagnetic low-temperature state

Abstract

We report x-ray scattering studies of nanoscale structural correlations in Nd${}_{1-x}$Sr${}_x$MnO${}_3$ and La${}_{1-x}$(Ca,Sr)${}_x$MnO${}_3$, $x$=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.

arXiv comment6 pages, 5 embedded eps figures

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Cited by in corpus (6)

• Phase separation and the effect of quenched disorder in $P{r}_{0.5}S{r}_{0.5}Mn{O}_3$
• First-order nature of the ferromagnetic phase transition in (La-Ca)MnO_3 near optimal doping
• Average Lattice Symmetry and Nanoscale Structural Correlations in Magnetoresistive Manganites
• Uncorrelated and correlated nanoscale lattice distortions in the paramagnetic phase of magnetoresistive manganites
• Chemical potential shift induced by double-exchange and polaronic effects in Nd_{1-x}Sr_xMnO_3
• Chemical potential landscape in band filling and bandwidth-control of manganites: Photoemission spectroscopy measurements