TY  - JOUR
AU  - Castellano, Carlo
AU  - Berti, Giulia
AU  - Ferretti, Maurizio
AU  - Martinelli, Alberto
AU  - Cimberle, M. R.
TI  - Strong enhancement of the ferromagnetic phase and local order in Ru substituted manganites studied by EXAFS and dc magnetizationmeasurements
JO  - Journal of alloys and compounds
VL  - 663
SN  - 0925-8388
CY  - Lausanne
PB  - Elsevier
M1  - PUBDB-2017-13415
SP  - 560 - 564
PY  - 2016
N1  - © Elsevier B.V. 
AB  - We report extended X-ray absorption fine structure (EXAFS) and dc magnetization measurements performed on (La<sub>1−x</sub>Ca<sub>x</sub>) (Mn<sub>1−</sub>yRu<sub>y</sub>)O<sub>3</sub> 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<sup>4+</sup> ions with those induced by the already studied analogous substitutions of Mn with non-Jahn-Teller Cr<sup>3+</sup> or Ni<sup>2+</sup> or Jahn-Teller Cu<sup>2+</sup>.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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000369060200076
DO  - DOI:10.1016/j.jallcom.2015.12.183
UR  - https://bib-pubdb1.desy.de/record/397768
ER  -