Exploiting B Site Disorder for Phase Control in the Manganites

Details Exploiting B Site Disorder for Phase Control in the Manganites Exploiting B Site Disorder for Phase Control in the Manganites

2007-10-11

arxiv.org/abs/0710.2278v3

Europhys. Lett. vol 84, 37007 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, pdflatex, 5 png figures

Scientific paper

10.1209/0295-5075/84/37007

Disorder on the active d element site is usually very disruptive for conduction and long range order in perovskite transition metal oxides. However, in the background of phase competition such `B site' dopants also act to promote one ordered phase at the expense of another. This occurs either through valence change of the transition metal or via creation of `defects' in the parent magnetic state. We provide a framework for understanding the complex variety of phenomena observed in B site doped manganites and identify the key parameters that control the physics. Using a spatially resolved analysis of B ions in various manganite phases we explain the existing data and predict new situations where highly polarisable phase separated states can be created.

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