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• W2037492762 abstract "Chromium has been substituted for ruthenium in $mathrm{Ca}mathrm{Ru}{mathrm{O}}_{3}$ up to 35%. It is found that chromium induces a ferromagnetic contribution showing a maximum fraction for $x=0.15$ in $mathrm{Ca}{mathrm{Ru}}_{0.85}{mathrm{Cr}}_{0.15}{mathrm{O}}_{3}$ with a Curie temperature $({T}_{mathrm{C}})$ of $ensuremath{sim}115phantom{rule{0.3em}{0ex}}mathrm{K}$. This change of magnetic ground state goes with an electronic localization, the resistivity at $5phantom{rule{0.3em}{0ex}}mathrm{K}$ increasing by more than 6 orders of magnitude as $x$ increases from $x=0.06$ to $x=0.35$. Concomitantly, a negative magnetoresistance is induced by the chromium substitution. In order to explain the chromium effect, it is suggested that each trivalent chromium couples antiferromagnetically to its ${mathrm{Ru}}^{4+∕5+}$ nearest neighbors. When surrounded by six ruthenium cations, this creates ``ferrimagnetic'' polarons in which ${T}_{mathrm{C}}$ is governed by the ${mathrm{Ru}}^{4+∕5+}--mathrm{O}--{mathrm{Cr}}^{3+}$ antiferromagnetic exchange $({T}_{mathrm{C}}ensuremath{sim}115phantom{rule{0.3em}{0ex}}mathrm{K})$. However, as the ${mathrm{Cr}}^{3+}$ concentration increases, the ${mathrm{Cr}}^{3+}text{ensuremath{-}}mathrm{O}text{ensuremath{-}}{mathrm{Cr}}^{3+}$ antiferromagnetic exchange (energy) $({T}_{mathrm{N}}ensuremath{sim}290phantom{rule{0.3em}{0ex}}mathrm{K})$ creates an antagonistic effect. This explains the existence of an optimum chromium content at $x=0.15$." @default.
• W2037492762 created "2016-06-24" @default.
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• W2037492762 date "2006-07-13" @default.
• W2037492762 modified "2023-10-18" @default.
• W2037492762 title "Ferromagnetism induced by chromium substitution in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi><mml:mi mathvariant=normal>Ru</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>perovskite" @default.
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• W2037492762 doi "https://doi.org/10.1103/physrevb.74.024410" @default.
• W2037492762 hasPublicationYear "2006" @default.
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