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- W2782997551 abstract "For half-doped manganese oxides that have a perovskite structure, $R{E}_{1ensuremath{-}mathrm{x}}A{E}_{mathrm{x}}mathrm{Mn}{mathrm{O}}_{3}$ ($x=0.5$) (RE and AE are rare-earth and alkaline-earth elements, respectively), the phase competition (stability) between the antiferromagnetic charge- or orbital-ordered insulator (CO/OO AFI), ferromagnetic metal (FM), layered (A-type) antiferromagnetic phase [AF(A)], and spin-glass-like insulator (SGI), have been studied using single crystals prepared by the floating zone method. The CO/OO AFI, FM, AF(A), and SGI are displayed on the plane of the disorder (the variance of the RE and AE cations) versus the effective one-electron bandwidth (the averaged ionic radius of the RE and AE). In the plane of the disorder versus the effective one-electron bandwidth, similar to the phase diagram of $R{E}_{1ensuremath{-}mathrm{x}}A{E}_{mathrm{x}}mathrm{Mn}{mathrm{O}}_{3}$ ($x=0.45$), the CO/OO AFI, FM, and SGI dominate at the lower-left, right, and upper regions, respectively. However, the CO/OO AFI for $x=0.5$ is more stable than that for $x=0.45$, and it expands to the plane points that correspond to the $R{E}_{0.5}mathrm{S}{mathrm{r}}_{0.5}mathrm{Mn}{mathrm{O}}_{3}$ ($RE=mathrm{Nd}$ and Sm) specimens as the hole concentration is commensurate with the ordering of $mathrm{M}{mathrm{n}}^{3+}$/$mathrm{M}{mathrm{n}}^{4+}$ with a ratio of 1/1. The $y$-dependent electronic phases for $R{E}_{0.5}{(mathrm{S}{mathrm{r}}_{1ensuremath{-}mathrm{y}}mathrm{B}{mathrm{a}}_{mathrm{y}})}_{0.5}mathrm{Mn}{mathrm{O}}_{3}$ ($0ensuremath{le}yensuremath{le}0.5$) ($RE=mathrm{Sm}$, $mathrm{N}{mathrm{d}}_{0.5}mathrm{S}{mathrm{m}}_{0.5}$, Nd, and Pr) show that the AF(A) intervenes between the CO/OO AFI and FM. Besides the region around ${(mathrm{L}{mathrm{a}}_{1ensuremath{-}mathrm{y}}mathrm{P}{mathrm{r}}_{mathrm{y}})}_{0.5}mathrm{S}{mathrm{r}}_{0.5}mathrm{Mn}{mathrm{O}}_{3}$ ($0ensuremath{le}yensuremath{le}1$) that has a smaller disorder, the AF(A) also exists at the regions around $R{E}_{0.5}{(mathrm{S}{mathrm{r}}_{1ensuremath{-}mathrm{y}}mathrm{B}{mathrm{a}}_{mathrm{y}})}_{0.5}mathrm{Mn}{mathrm{O}}_{3}$ ($0<y<0.3$) ($RE=mathrm{Sm}$ and $mathrm{N}{mathrm{d}}_{0.5}mathrm{S}{mathrm{m}}_{0.5}$) that have a relatively larger disorder. This indicates that the AF(A) is rather robust against the increased disorder, even though an ordering of the (${x}^{2}ensuremath{-}{y}^{2}$) orbital occurs. This study has comprehensively investigated the effects of the disorder on the AF(A) as well as on the competition between the CO/OO AFI, FM, and AF(A) that is unique to $x=0.5$. The comparison of phase diagrams between $x=0.45$ and 0.5 brings further insights into the understanding of the rich electronic phases of manganites." @default.
- W2782997551 created "2018-01-26" @default.
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- W2782997551 date "2018-01-11" @default.
- W2782997551 modified "2023-09-26" @default.
- W2782997551 title "Electronic phase diagram of half-doped perovskite manganites on the plane of quenched disorder versus one-electron bandwidth" @default.
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- W2782997551 doi "https://doi.org/10.1103/physrevb.97.014409" @default.
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