Volume 87, Number 2, July 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 August 2009|
Doping fluctuation-driven magneto-electronic phase separation in LaSrxCoO3 single crystals
Department of Chemical Engineering and Materials Science, University of Minnesota Minneapolis, MN 55455, USA
2 NIST Center for Neutron Research, National Institute for Standards and Technology Gaithersburg, MD 20899, USA
3 Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
Corresponding author: firstname.lastname@example.org
Accepted: 9 July 2009
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 LaSrxCoO3. 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.
PACS: 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 71.30.+h – Metal-insulator transitions and other electronic transitions / 72.15.Gd – Galvanomagnetic and other magnetotransport effects
© EPLA, 2009
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