Structural and magnetic properties of Cu substituted manganites studied by EXAFS and dc magnetization measurements
Articolo
Data di Pubblicazione:
2009
Citazione:
Structural and magnetic properties of Cu substituted manganites studied by EXAFS and dc magnetization measurements / C. Castellano, M. Ferretti, A. Martinelli, M.R. Cimberle. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 478:1-2(2009 Jun 10), pp. 479-483.
Abstract:
We report extended X-ray absorption fine structure (EXAFS) measurements at the Mn K-edge and dc
magnetic measurements performed on (La1−xCax)(Mn1−yCuy)O3 samples (x = 0.37 and 0.75 and y = 0.03
or 0.08), thus comparing the effects determined by the partial Mn substitution with Jahn–Teller Cu2+ ions
with those induced by the already studied analogous substitution of Mn with non-Jahn-Teller Cr3+.
Hence, in the present paper we complete our study on the influence of chemical Mn site substitutions
on the nanoscale phase inhomogeneity characteristic of these strongly correlated electron systems.
We observe that the Cu2+ substitution determines two very different effects in the two compositions
belonging from the opposite sides of the phase diagram. In the x = 0.37 case itweakens the ferromagnetic
ordering thus favouring the antiferromagnetic charge ordered phase component, while in the x = 0.75 one
it does not significantly modify the charge ordering already present in the system, differently from what
previously observed in presence of non-Jahn-Teller Cr3+ substitution.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Oxide materials; Phase transitions; Magnetic measurements; EXAFS
Elenco autori:
C. Castellano, M. Ferretti, A. Martinelli, M.R. Cimberle
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