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• W2065877122 abstract "Crystal and magnetic structures of complex manganese oxides ${mathrm{Sr}}_{2}{mathrm{GaMnO}}_{5+ensuremath{delta}}$ $(ensuremath{delta}ensuremath{simeq}0.01,0.52)$ and ${mathrm{Ca}}_{2}{mathrm{GaMnO}}_{5+ensuremath{delta}}$ $(ensuremath{delta}ensuremath{simeq}0.05)$ were studied by neutron powder diffraction (ND) and $ensuremath{mu}mathrm{SR}$ technique in the temperature range 2--300 K. The crystal structures contain single ${mathrm{MnO}}_{2}$ layers separated by three nonmagnetic cation-oxygen layers. The principal difference between the $ensuremath{delta}ensuremath{simeq}0$ and $ensuremath{delta}ensuremath{simeq}0.5$ compounds is the Mn valence: ${mathrm{Mn}}^{3+}$ or ${mathrm{Mn}}^{4+},$ and the structure of the $({mathrm{GaO}}_{1+ensuremath{delta}})$ buffer layer, which is formed by tetrahedra or partially filled octahedra, respectively. The magnetic moments of the manganese ions are coupled antiferromagnetically in the ${mathrm{MnO}}_{2}$ plane, but antiferromagnetically $(G$ type) or ferromagnetically $(C$ type) between the planes for the reduced and oxidized compositions, respectively. The transition from the G- to C-type magnetic structure by oxygen doping is explained by strong diagonal $180ifmmode^circelsetextdegreefi{}$ superexchange antiferromagnetic interaction between ${mathrm{Mn}}^{4+}$-ions in the adjacent layers through additional oxygen atoms in the GaO buffer layer. The magnetic moments in Sr-based samples are appreciably reduced in comparison with the spin-only values of the corresponding Mn ion. By using complementary information on local magnetic field distribution from $ensuremath{mu}mathrm{SR}$ we show that the reduced magnetic moments seen by ND are caused by the presence of locally flipped Mn spins and a short-ranged $(40mathrm{AA{}})$ antiferromagnetic phase. The magnetic disorder can be caused by the disorder observed in the oxygen positions of the ${mathrm{GaO}}_{1+ensuremath{delta}}$ layer, because the coupling between the ${mathrm{MnO}}_{2}$ layers is mediated by the geometry of the superexchange path through these oxygen atoms." @default.
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• W2065877122 date "2002-11-12" @default.
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• W2065877122 title "Atomic and magnetic structures, disorder effects, and unconventional superexchange interactions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>MnGaO</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns…" @default.
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• W2065877122 doi "https://doi.org/10.1103/physrevb.66.184412" @default.
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