Journal Article

PUBDB-2017-13415

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Strong enhancement of the ferromagnetic phase and local order in Ru substituted manganites studied by EXAFS and dc magnetizationmeasurements

Castellano, C. (Corresponding author)Extern* ; Berti, G. ; Ferretti, M.Extern* ; Martinelli, A.Extern* ; Cimberle, M. R.

2016
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2015.12.183  doi:10.3204/PUBDB-2017-13415

Abstract: We 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.

Note: © Elsevier B.V.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. DORIS Beamline E4 (DORIS III)

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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