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Magnetic properties of polycrystalline CaMn1-xRuxO3 (x = 0 - 0.5) sampleswere investigated in the temperature range 4.2 - 250 K, under external magneticfield up to 15 kOe and under hydrostatic pressure up to 12 kbar. Transportproperties of the samples with x = 0.1, 0.2, 0.4, 0.5 were also investigatedunder pressure up to 10 kbar. For x up to 0.4, the pressure was found tosuppress ferromagnetic correlations and to increase the resistivity, while forx = 0.5 to act in the opposite way. While long ferromagnetic order iscompletely suppressed, in small clusters ferromagnetic correlations probablysurvive under pressure, as was revealed for CaMn0.9Ru0.1O3. The pressure effecton the magnetic interactions and on the volume of ferromagnetic phase was foundto depend strongly on the Ru-content, and absolute value of the pressurecoefficient of spontaneous magnetization was found to decrease practicallylinearly with increasing x in the range 0.1 < x < 0.5. The experimental dataare discussed in the frame of proposed energy-level diagram, which includesmagneto-impurity states at low and moderate Ru-doping and mixed-valence statesof Ru presented by a strongly-correlated t2g-like band at heavy Ru-doping. Animpact of disorder introduced by Ru-doping on the energy diagram and on derivedmagnetic interactions is discussed. Predictions of the model regarding thepressure effects on conductivity and temperature scales characteristic formagnetic interactions are in reasonable agreement with experiment.Comment: 33 pages, including 8 figures, to be published in Phys. Rev.

physical review. b, condensed matter and materials physics

Interplay between itinerant and localized states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>CaMn</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>Ru</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:mspace width="0.3em" /><mml:mo>(</mml:mo><mml:mi>x</mml:mi><mml:mo>⩽</mml:mo><mml:mn>0.5</mml:mn><mml:mo…

Interplay between itinerant and localized states inCaMn1−xRuxO3(x⩽0.5