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- W2035505561 abstract "We have investigated the transport and magnetic properties of the perovskite ${mathrm{LaCo}}_{1ensuremath{-}y}{mathrm{Ni}}_{y}{mathrm{O}}_{3},$ an alloy of ${mathrm{LaCoO}}_{3}$ (a semiconductor that exhibits spin-state transitions) and ${mathrm{LaNiO}}_{3}$ (a paramagnetic metal). The metal-insulator transition (MIT) was found to occur at $y=0.40.$ On the insulating side of the transition the conductivity obeys Mott variable range hopping with a characteristic temperature ${(T}_{0})$ that varies with y in a manner consistent with the predictions of the scaling theory of electron localization. On the metallic side the low temperature conductivity (down to 0.35 K) varies as ${T}^{1/2}$ due to the effects of electron-electron interaction in the presence of disorder. The composition dependence of the low-temperature conductivity in the critical region fits the scaling theory of electron localization with a conductivity critical exponent close to unity, consistent with the scaling of ${T}_{0}$ in the insulating phase. A large negative magnetoresistance is observed (up to 70% in 17 T) which increases monotonically with decreasing temperature and is smoothly decreased through the MIT. The magnetic properties show that doping ${mathrm{LaCoO}}_{3}$ with Ni leads to a rapid destruction of the low spin-state for ${mathrm{Co}}^{3+}$ ions, followed by the onset of distinct ferromagnetic interactions at higher Ni content. Similar to ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{CoO}}_{3},$ the system shows a smooth evolution from spin-glass to ferromagnetic ground states, which is interpreted in terms of the formation of ferromagnetic clusters. In contrast to ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{CoO}}_{3}$ further doping does not lead to a bulk ferromagnetlike state with a large ${T}_{C},$ despite the clear existence of ferromagnetic interactions. We suggest that this is due to a limitation of the strength of the ferromagnetic interactions, which could be related to the fact that Ni rich clusters are not thermodynamically stable. The ferromagnetic clusters in ${mathrm{LaCo}}_{1ensuremath{-}y}{mathrm{Ni}}_{y}{mathrm{O}}_{3}$ do not percolate with increasing y explaining the lack of a high-${T}_{C}$ ferromagnetic state and the fact that the MIT is a simple Mott-Anderson transition rather than a percolation transition. Finally, in contrast to previous works (which focused on a single composition) we find no clear correlation between freezing temperature and the onset of magnetoresistance." @default.
- W2035505561 created "2016-06-24" @default.
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- W2035505561 date "2004-04-05" @default.
- W2035505561 modified "2023-09-30" @default.
- W2035505561 title "Metal-insulator transition, giant negative magnetoresistance, and ferromagnetism in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>LaCo</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ni</mml:mi></mml:mrow><mml:mrow><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub…" @default.
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- W2035505561 doi "https://doi.org/10.1103/physrevb.69.134407" @default.
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