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000397768 1001_ $$0P:(DE-H253)PIP1008227$$aCastellano, Carlo$$b0$$eCorresponding author
000397768 245__ $$aStrong enhancement of the ferromagnetic phase and local order in Ru substituted manganites studied by EXAFS and dc magnetizationmeasurements
000397768 260__ $$aLausanne$$bElsevier$$c2016
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000397768 520__ $$aWe report extended X-ray absorption fine structure (EXAFS) and dc magnetization measurements performed on (La$_{1-x}$Ca$_x$) (Mn$_{1-}$yRu$_y$)O$_3$ samples (x = 0.37 and 0.75 and y = 0.03 or 0.08).In the nanoscale phase inhomogeneity scenario characteristic of these complex oxides, we compare the effects induced by the partial substitution of Mn with mixed valence non-Jahn-Teller Ru5+ and at most very weak Jahn-Teller Ru$^{4+}$ ions with those induced by the already studied analogous substitutions of Mn with non-Jahn-Teller Cr$^{3+}$ or Ni$^{2+}$ or Jahn-Teller Cu$^{2+}$.We find evidence both from dc magnetization and EXAFS that the ruthenium doping induces a huge effect, clearly enhancing (more efficiently than is the case for the other dopants) the double exchange effect and consequently the metallic/ferromagnetic phase and the local structural order at the expenses of the charge-ordered phase component. In the x = 0.75 long-range charge-ordered system these effects are much more evident, as expected, while for x = 0.37 the magnetic ion partial substitution does not significantly modify the metal-insulator and ferromagnetic transitions, already present in the parent compound.
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000397768 7001_ $$0P:(DE-HGF)0$$aBerti, Giulia$$b1
000397768 7001_ $$0P:(DE-H253)PIP1009711$$aFerretti, Maurizio$$b2
000397768 7001_ $$0P:(DE-H253)PIP1010395$$aMartinelli, Alberto$$b3
000397768 7001_ $$0P:(DE-HGF)0$$aCimberle, M. R.$$b4
000397768 773__ $$0PERI:(DE-600)2012675-X$$a10.1016/j.jallcom.2015.12.183$$gVol. 663, p. 560 - 564$$p560 - 564$$tJournal of alloys and compounds$$v663$$x0925-8388$$y2016
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