IntroductionOver the past few years, the perovskite manganites Ln1−xAxMnO3 (Ln = rare earth, A = alkaline earth) have attracted great attention because of their attractive physical properties and potential applications, such as magnetic recording media, information storage, spintronics, and sensors. Recently, the phase diagrams of these compounds have shown a critical behavior involving competing spin, charge, orbital, and lattice orders, which stimulate further studies of these materials. Especially, for the half‐doped R0.5A0.5MnO3 compounds with relatively smaller average A‐site ionic radii 〈rA〉, an interesting CE‐type anti‐ferromagnetic (AFM) structure is presented. Both ferromagnetic (FM) and AFM interactions may coexist in the compounds, due to the coexistence of the double exchange (DE) and the super‐exchange (SE) interactions among Mn ions. Previous studies also show charge ordered (CO) state associated with AFM insulating behavior in the half‐doped compounds, which is strongly affected by 〈rA〉. With decreasing 〈rA〉, the decrease of the Mn–O–Mn angle causes the reduction of hybridization between the Mn 3d and O 2p states, which induces a decrease of the eg level and hence weakens the DE coupling. As a result, the metallic and FM transition temperatures decrease. In addition, it has also been argued that the net cationic size mismatch can significantly influence the
Physica Status Solidi (B) Basic Solid State Physics – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ;
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