Reference : La0.7Ca0.3MnO3 / Mn3O4 composites: does an insulating secondary phase always enhance the...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/112480
La0.7Ca0.3MnO3 / Mn3O4 composites: does an insulating secondary phase always enhance the low field magnetoresistance of manganites?
English
Bhame, Shekhar [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
Fagnard, Jean-François [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Pekala, Marek [Warsaw university > > > >]
Vanderbemden, Philippe mailto [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Vertruyen, Bénédicte mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
2012
Journal of Applied Physics
American Institute of Physics
111
063905
Yes (verified by ORBi)
International
0021-8979
Melville
NY
[en] magnetoresistance ; manganites ; composites
[en] Composites of magnetoresistive La0.7Ca0.3MnO3 (LCMO) with insulating Mn3O4 are useful as a model system because no foreign cation is introduced in the LCMO phase by interdiffusion during the heat treatment. Here we report the magnetotransport properties as a function of sintering temperature Tsinter for a fixed LCMO/Mn3O4 ratio. Decreasing Tsinter from 1250°C to 800°C causes an increase in low field magnetoresistance (LFMR) that correlates with the decrease in crystallite size (CS) of the LCMO phase. When plotting LFMR at (77 K, 0.5 T) vs. 1/CS, we find that the data for the LCMO/Mn3O4 composites sintered between 800°C and 1250°C follow the same trend line as data from the literature for pure LCMO samples with crystallite size > ~25 nm. This differs from the LFMR enhancement observed by many authors in the "usual" manganite composites, i.e., composites where the insulating phase contains cations other than La, Ca or Mn. This difference suggests that diffusion of foreign cations into the grain boundary region is a necessary ingredient for the enhanced LFMR.
Université de Liège ; Wallonie-Bruxelles-International ; Polish Ministry of Science
D09/09
Researchers ; Professionals
http://hdl.handle.net/2268/112480
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The following article appeared in J. Appl. Phys. 111, 063905 (2012) and may be found at http://jap.aip.org/resource/1/japiau/v111/i6/p063905_s1.

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