Issue 28, 2012

Evolution of the crystal and magnetic structure of the R2MnRuO7 (R = Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) family of pyrochlore oxides

Abstract

The members of the family of pyrochlore oxides with the formula R2MnRuO7 (R = Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) have been synthesized and characterized. Polycrystalline samples were prepared by a soft chemistry procedure involving citrates of the different metal ions, followed by thermal treatments in air or O2 pressure. The crystallographic and magnetic structures have been analysed from X-ray diffraction (XRD) and neutron powder diffraction (NPD) data, in complement with magnetic measurements; the evolution along the series of the crystallographic parameters (unit-cell parameters, bond distances and angles) is discussed. In R2MnRuO7 pyrochlores, Mn and Ru ions statistically occupy the 16c sites in a cubic unit cell with space group Fd[3 with combining macron]m, which defines an intrinsic frustrated three-dimensional system. In all the cases, the low-temperature NPD data unveils an antiferromagnetic coupling of two subsets of Mn4+/Ru4+ spins, indicating that the magnetic frustration is partially relieved by the random distribution of Mn and Ru over the 16c sites. At lower temperatures there is a polarization of the R3+ magnetic moments, which also participate in the magnetic structure, when a magnetic rare earth is present.

Graphical abstract: Evolution of the crystal and magnetic structure of the R2MnRuO7 (R = Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) family of pyrochlore oxides

Article information

Article type
Paper
Submitted
15 Feb 2012
Accepted
01 May 2012
First published
02 May 2012

Dalton Trans., 2012,41, 8575-8584

Evolution of the crystal and magnetic structure of the R2MnRuO7 (R = Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) family of pyrochlore oxides

R. Martínez-Coronado, M. Retuerto, M. T. Fernández and J. A. Alonso, Dalton Trans., 2012, 41, 8575 DOI: 10.1039/C2DT30350G

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