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• W1615030555 abstract "The temperature T and magnetic-field H dependences of anisotropic in-plane ${ensuremath{rho}}_{mathrm{ab}}$ and out-of-plane ${ensuremath{rho}}_{c}$ resistivities are investigated in single crystals of the bilayer manganite ${mathrm{La}}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7}.$ Below the Curie transition temperature ${T}_{c}$=125 K, ${ensuremath{rho}}_{mathrm{ab}}$ and ${ensuremath{rho}}_{c}$ display almost the same temperature dependence with an up-turn around 50 K. In the metallic regime (50 K $<~T<~$ 110 K), both ${ensuremath{rho}}_{mathrm{ab}}(T)$ and ${ensuremath{rho}}_{c}(T)$ follow a ${T}^{9/2}$ dependence, consistent with the two-magnon scattering. We found that the value of the proportionality coefficient ${B}_{mathrm{ab}}^{mathrm{fit}}$ and the ratio of the exchange interaction ${J}_{mathrm{ab}}{/J}_{c},$ obtained by fitting the data, are in excellent agreement with the calculated ${B}_{mathrm{ab}}$ based on the two-magnon model and ${J}_{mathrm{ab}}{/J}_{c}$ deduced from neutron scattering, respectively. This provides further support for this scattering mechanism. At even lower T, in the nonmetallic regime $(T<50 mathrm{K}),$ both the in-plane ${ensuremath{sigma}}_{mathrm{ab}}$ and out-of-plane ${ensuremath{sigma}}_{c}$ conductivities obey a ${T}^{1/2}$ dependence, consistent with weak-localization effects. Hence this demonstrates the three-dimensional metallic nature of the bilayer manganite ${mathrm{La}}_{1.2}{mathrm{Sr}}_{1.8}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ at $T<{T}_{c}.$" @default.
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• W1615030555 date "2002-03-26" @default.
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• W1615030555 title "Low-temperature electrical transport in bilayer manganite<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1.2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>1.8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Mn</mml:mi></mml:mrow…" @default.
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• W1615030555 doi "https://doi.org/10.1103/physrevb.65.134439" @default.
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