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• W2005307006 abstract "The magnetic and electronic properties of the perovskite system $({mathrm{La}}_{0.7ensuremath{-}x}{mathrm{Gd}}_{x}){mathrm{Sr}}_{0.3}{mathrm{MnO}}_{3}$ $(0<~x<~0.6)$ have been investigated by measurements of magnetization, resistivity and magnetoresistance. The substitution of Gd on La sites not only results in a decrease of the Curie temperature ${T}_{c}$ and the magnetization, but also induces cluster-glass and ferrimagnetic behaviors. For $x<~0.15,$ the system is metallic below 300 K, while for $0.2<~x<~0.4,$ there is an insulating-metallic transition. For $x>~0.5,$ the system is insulating. For $x>~0.3,$ the resistivity in the paramagnetic regime can be fitted by variable-range hopping model. Both the high-field (6 T) and low-field (1 T) magnetoresistances are significantly enhanced by Gd substitution. The steep insulating-metallic transition in $x=0.3$ and $0.4$ samples gives rise to a large temperature coefficient of resistance. Infrared spectra measurements provide strong evidence of the change of Mn-O-Mn bond angle due to Gd substitution. These results suggest that both the average A-site ionic radius (tolerance factor) and the additional magnetic coupling between ${mathrm{Gd}}^{3+}$ and ${mathrm{Mn}}^{3+}/{mathrm{Mn}}^{4+}$ sublattice are important factors in determining the magnetic and electronic states. The enhancement of colossal magnetoresistance and $Iensuremath{-}M$ transition are interpreted based on the scenario of phase separation." @default.
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• W2005307006 date "2002-09-16" @default.
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• W2005307006 title "Magnetism, electronic transport, and colossal magnetoresistance of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.7</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Gd</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo><…" @default.
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• W2005307006 doi "https://doi.org/10.1103/physrevb.66.094414" @default.
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