Issue 35, 2012

Correlation between the crystal structure and the Curie temperature in RCu3(Mn3Fe)O12 (R = rare-earth) complex perovskites

Abstract

New members of the family of complex-perovskite oxides with the formula RCu3(Mn3Fe)O12 (R = Ce, Pr, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) have been synthesized and characterized. Polycrystalline samples have been prepared from citrate precursors treated under moderate pressure conditions (2–3.5 GPa) and 1000 °C in the presence of KClO4 as an oxidizing agent. All the samples have been studied by neutron powder diffraction (NPD) at 300 K and 2 K. These oxides crystallize in the cubic space group Im[3 with combining macron] (no. 204). Mn4+/Mn3+ and Fe3+ occupy at random the octahedral B positions of the perovskite structure. These materials have also been characterized by magnetic and magnetotransport measurements. The observed enhancement of TC along the RCu3(Mn3Fe)O12 series is understood as an effect of the chemical pressure on the (Mn,Fe)–O bonds as R3+ size decreases. The semiconducting behaviour observed in all of the samples is related with the introduction of Fe at B position. Despite the drastic change of the transport properties, significant negative magnetoresistance values are observed in the Fe-containing compounds both at 10 K and 300 K.

Graphical abstract: Correlation between the crystal structure and the Curie temperature in RCu3(Mn3Fe)O12 (R = rare-earth) complex perovskites

Supplementary files

Article information

Article type
Paper
Submitted
21 Mar 2012
Accepted
17 Jun 2012
First published
20 Jun 2012

Dalton Trans., 2012,41, 10670-10679

Correlation between the crystal structure and the Curie temperature in RCu3(Mn3Fe)O12 (R = rare-earth) complex perovskites

P. Kayser, M. J. Martínez-Lope, M. Retuerto, J. Sánchez-Benítez, M. T. Fernández-Díaz and J. A. Alonso, Dalton Trans., 2012, 41, 10670 DOI: 10.1039/C2DT30647F

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