Journal of Applied Physics · 1968 · 438 citations · 3 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsInorganic ChemistryMagnetic MaterialsAntiferromagnetismFerromagnetic MaterialsFerromagnetismMagnetic Properties Of SolidsMagnetism In SolidsMagnetism Of Inorganic CompoundsAntiferromagnetic ExchangeAntiferromagnetic OrderingAntiferromagnetic OxidesMagnetic PropertiesResistivityResistivity Measurement
CaRuO3 is predicted to have narrower 4d bands, leading to antiferromagnetism. Magnetization, neutron‑diffraction, and resistivity measurements show that SrRuO₃ is ferromagnetic with TC≈160 K and a reduced spontaneous moment, while CaRuO₃ exhibits antiferromagnetic exchange with TN≈110 K and parasitic ferromagnetism below TN, confirming both compounds as spontaneous collective‑electron magnets.
Magnetization measurements of SrRuO3 and CaRuO3 confirm that SrRuO3 is ferromagnetic with TC = (160±5) °K and that CaRuO3 has antiferromagnetic exchange interactions dominant. They further identify in CaRuO3 a Néel temperature TN = (110±10) °K and parasitic ferromagnetism below TN having a σ0 = (3.2±0.4) × 10−2 emu/g at 4.2°K. High-field (to 125 kOe) magnetization and neutron-diffraction data for SrRuO3 are consistent with a reduced spontaneous ferromagnetic moment μ0 = (1.4±0.4) μB and no ordered antiferromagnetic component. Resistivity measurements confirm a low resistivity (ρ<10−3Ω·cm) at room temperature having a metallic temperature coefficient. It is concluded that both compounds represent spontaneous collective-electron magnetism and that the reduced moment of SrRuO3 is due to holes in both the up-spin and down-spin bands. Antiferromagnetic CaRuO3 is predicted to have narrower ``4d'' bands.
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Magnetic Interactions in Ternary Ruthenium Oxides
Alan Callaghan, Carl W. Moeller, Roland Ward · Inorganic Chemistry · 1966 · 433 citations