Abstract
Structural, electrical transport and magnetic properties of La1−xSrxCo1−xRuxO3 (0≤x≤0.6) have been investigated. Sr and Ru co-doped LaCoO3 (LCO) at La and Co sites reveals a structural phase transition from rhombohedral to monoclinic with increase of x. X-ray photoelectron spectroscopy shows that Ru is present in the mixed valence state, Ru4+ and Ru5+ accompanied with Co3+ and Co2+ valencies. Pure LCO reveals a change from charge gap at higher temperature to spin gap at lower temperature in charge transport process. Higher spin configuration of Co3+ stabilizes ferromagnetic ground state in LCO. Temperature dependence of electrical resistivity indicates a semiconducting behavior for the entire composition range (0≤x≤0.6). High degree of disorder of Co and Ru ions leads to spin glass and cluster glass phase for x≤0.2. The observation of Curie temperature at about 154 K indicates the phase segregation into ferromagnetic SrRuO3 (SRO) for x≥0.3. A critical behavior study for the ferromagnetic phase suggests that the ferromagnetism can be described by mean field model. The co-existence of semiconducting and ferromagnetism can be attributed to random distribution of four cations, La, Sr, Co and Ru.
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