Intrinsic chemical and structural inhomogeneity in lightly doped La(1-x)Sr(x)MnO(3)

Abstract

X-ray absorption fine structure measurements of the Sr and La K edges of the solid solution La(1-x)Sr(x)MnO(3) reveal a consistent deviation from a random distribution of Sr at the La/Sr sites for x~0.3. Local structural disorder on the cation sublattice in the low-x samples is also observed to differ in the vicinity of the La-rich and Sr-rich clusters. The local clustering and structural disorder establish an intrinsic chemical as well as structural inhomogeneity on the nanometer scale, which may provide a mechanism for the nucleation of magnetoelectronic phase separation.

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References in corpus (4)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
• Explanation of Giant Cluster Coexistence in Doped Manganites and Other Compounds
• Phase separation, percolation and giant isotope effect in manganites

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• Direct Observation of High-Temperature Polaronic Behavior In Colossal Magnetoresistive Manganites
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• Polaron-mediated spin correlations in metallic and insulating La${}_{1-x}{A}_x$MnO${}_3$ ($A$=Ca, Sr, or Ba)
• Inhomogeneous phase separation and domain wall dynamics in the orthorhombically distorted La_{0.87}MnO_x
• Spin wave damping arising from phase coexistence below $T_c$ in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$
• Damping and softening of transverse acoustic phonons in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ and La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$