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Doping fluctuation-driven magneto-electronic phase separation in La1−xSrxCoO3 single crystals



Christine He, S. El-Khatib, J. Wu, Jeffrey Lynn, H. Zheng, J. F. Mitchell, C. Leighton


In recent years it has become clear that complex oxides provide an exceptional platform for the discovery of new physics as well as a considerable challenge to our understanding of correlated electrons. The tendency of these materials to display nanoscale electronic and magnetic inhomogeneity is a good example. Here, we have applied a variety of experimental techniques to investigate this magneto-electronic phase separation in a model system —the doped cobaltite La1−xSrxCoO3. Comparing experimental data over a wide range of doping with statistical simulations, we conclude that the magneto-electronic inhomogeneity is driven solely by inevitable local compositional fluctuations at nanoscopic length scales. The phase separation is thus doping fluctuation-driven rather than electronically driven, meaning that more complex electronic phase separation models are not required to understand the observed phenomena in this material.
Europhysics Letters


neutron scattering, magnetic clusters, percolation, perovskites, oxides


He, C. , El-Khatib, S. , Wu, J. , Lynn, J. , Zheng, H. , Mitchell, J. and Leighton, C. (2009), Doping fluctuation-driven magneto-electronic phase separation in La1−xSrxCoO3 single crystals, Europhysics Letters, [online],, (Accessed April 19, 2024)
Created August 5, 2009, Updated March 25, 2024