Magnetic properties and colossal magnetoresistance of La(Ca)Mn O3 materials doped with Fe
Year: 1996
Type: article
Abstract: The effect of Fe doping (20%) on the Mn site in the ferromagnetic ($x=0.37$) and the antiferromagnetic ($x=0.53$) phases of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ has been studied. The same ionic radii of ${\mathrm{Fe}}^{3+}$ and ${\mathrm{Mn}}^{3+}$ cause no structure change in either series, yet conduction and ferromagnetism have been consistently suppressed by Fe doping. Colossal magnetoresistance has been shifted to lower temperatures, and in some cases enhanced by Fe doping. Doping with Fe bypasses the usually dominant lattice effects, but depopulates the hopping electrons and thus weakens the double exchange.
Authors: K. H. Ahn, X. W. Wu, K. Liu, C. L. Chien
Institution: Johns Hopkins University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1982728332