Enhanced magnetism and suppressed magnetoelastic coupling induced by electron doping in Ca$_{1-x}$Y$_{x}$MnReO$_6$

A. S. Cavichini; M. T. Orlando; M. C. A. Fantini; R. Tartaglia; C. W. Galdino; F. Damay; F. Porcher; E. Granado

doi:10.1088/1361-648X/ac61b5

paper

Enhanced magnetism and suppressed magnetoelastic coupling induced by electron doping in Ca $_{1 - x}$ Y $_{x}$ MnReO $_{6}$

arXiv:2202.08220 · doi:10.1088/1361-648X/ac61b5

Abstract

The Ca $_{2}$ MnReO $_{6}$ double perovskite is a spin-orbit-assisted Mott insulator with exotic magnetic properties, including a largely non-collinear Mn $^{2 +}$ spin arrangement and nearly orthogonal coupling between such spins and the much smaller Re $5 d$ magnetic moments. Here, the electron-doped compound Ca $_{1.7}$ Y $_{0.3}$ MnReO $_{6}$ is investigated. Neutron and X-ray powder diffraction confirm that nearly full chemical order is maintained at the Mn and Re sites under the Y substitution at the Ca site. X-ray absorption measurements and an analysis of the Mn-O/Re-O bond distances show that the Mn oxidation state remains stable at +2 whereas Re is reduced upon doping. The electron doping increases the magnetic ordering temperature from $T_{c} = 121$ to $150$ K and also enhances significantly the ferromagnetic component of the Mn spins at the expense of the antiferromagnetic component at the base temperature ( $T = 3$ K). The lattice parameter anomalies at $T_{c}$ observed in the parent compound are suppressed by the electron doping. The possible reasons for the enhanced magnetism and the suppressed magnetoelastic coupling in Ca $_{1.7}$ Y $_{0.3}$ MnReO $_{6}$ are discussed.

arXiv commentArticle: 14 pages, 6 figures. Appendix: 5 pages, 5 figures. Submitted to Journal of Physics: Condensed Matter

Enhanced magnetism and suppressed magnetoelastic coupling induced by electron doping in Ca1−x​Yx​MnReO6​

Abstract

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Enhanced magnetism and suppressed magnetoelastic coupling induced by electron doping in Ca $_{1 - x}$ Y $_{x}$ MnReO $_{6}$