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A full range of ${\mathrm{SrRu}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3}$ perovskite solid solutions $(0lxl1)$ has been prepared using high temperatures and pressures up to $10.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The structure changes from orthorhombic Pbnm at low $x$ through a previously unreported rhombohedral $R\overline{3}c$ phase at $x=0.4$ to cubic $Pm\overline{3}m$ for $0.5lxl1$. No $\mathrm{Cr}∕\mathrm{Ru}$ order is evidenced at any $x$. A substantial ${\mathrm{Ru}}^{4+}+{\mathrm{Cr}}^{4+}\ensuremath{\rightarrow}{\mathrm{Ru}}^{5+}+{\mathrm{Cr}}^{3+}$ charge transfer is evidenced by a volume discontinuity close to $x=0.5$. Low Cr-doped materials $(xl0.3)$ are itinerant, and ferromagnetic below 160\char21{}$190\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and $xg0.7$ materials are itinerant and Pauli paramagnetic, but a substantial insulating region is found between these limits. Neutron diffraction shows the $x=0.4$ material to be antiferromagnetic with a high N\'eel temperature $\ensuremath{\sim}400\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and a saturated moment of $1.7{\ensuremath{\mu}}_{B}$, despite the large $\mathrm{Cr}∕\mathrm{Ru}$ disorder. A $50\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ magnetic transition and a low temperature structural phase change to orthorhombic Imma symmetry have been discovered in ${\mathrm{SrCrO}}_{3}$, suggesting that the ground state of this simple perovskite is more complex than was previously assumed.

physical review b

Charge transfer and antiferromagnetic insulator phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>SrRu</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Cr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>perovskites: Solid solutions between two itinerant electron oxides

Charge transfer and antiferromagnetic insulator phase inSrRu1−xCrxO3perovskites: Solid solutions between two itinerant electron oxides