Effect of Chemical Pressure on High Temperature Ferrimagnetic Double Perovskites Sr2CrOsO6 and Ca2CrOsO6

Abstract

The ordered double perovskites Sr2CrOsO6 and Ca2CrOsO6 have been synthesized and characterized with neutron powder diffraction, electrical transport measurements, and high field magnetization experiments. Sr2CrOsO6 and Ca2CrOsO6 crystallize with R-3 and P21/n space group symmetry, respectively. Both materials are found to be ferrimagnetic insulators with saturation magnetizations near 0.2 μB. Sr2CrOsO6 orders at 660 K, showing non-monotonic magnetization temperature dependence, while Ca2CrOsO6 orders at 490 K and does not show non-monotonic behavior. Evidence for a theoretically predicted canted magnetic structure in Sr2CrOsO6 is sought and not found.

18 pages and 8 figures

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• Magnetically driven metal-insulator transition in NaOsO3
• Magnetic and electric properties of double-perovskites and estimation of their Curie temperatures by ab initio calculations
• Half Semimetallic Antiferromagnetism in the Sr${}_2$CrTO${}_6$ System, T=Os, Ru
• Theory of High T${}_c$ Ferrimagnetism in a Multi-orbital Mott Insulator
• Magnetic order and electronic structure of 5d3 double perovskite Sr2ScOsO6
• High antiferromagnetic transition temperature of a honeycomb compound SrRu${}_2$O${}_6$
• Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOsO6 and Ca2CoOsO6

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• Complex magnetic properties in the mixed 4f -5d double perovskite iridates Ln2ZnIrO6 (Ln = Nd, Sm, Eu & Gd)
• Fate of multipolar physics in $5d^2$ double perovskites
• Varying magnetism in the lattice distorted Y2NiIrO6 and La2NiIrO6