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• W2015643886 abstract "We report a series of magnetic and magnetotransport studies performed on Ga-substituted manganite compounds ${mathrm{La}}_{2ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{MnGaO}}_{6}(x<~0.7).$ We replace half of the Mn ions in ${mathrm{LaMnO}}_{3}$ with diamagnetic ions ${mathrm{Ga}}^{3+}$ and find that the system transforms into a ferromagnet as the result of local coherent and incoherent distortions. Following additional doping with Sr ions we find that the ${mathrm{La}}_{2ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{MnGaO}}_{6}$ compounds remain ferromagnetic up to $xensuremath{sim}0.3$ but for higher concentrations the competition between the ferromagnetic and antiferromagnetic superexchange interactions, together with the randomness in distribution of the magnetic ions, lead to magnetic frustration, cluster-glass and spin-glass behavior. All compounds are insulating and the activation energy decreases almost linearly with x. $ensuremath{mu}mathrm{SR}$ measurements suggest the existence of short-range magnetic correlations in the high-temperature region. We measure a significant increase in the muon-spin relaxation rate at low temperatures due to fluctuations of random internal magnetic fields. The observed magnetoresistance in the high-temperature region is mainly a consequence of the reduction of the spin disorder on a local scale, and is as high as 50% in 14 T and $T>100mathrm{K}$ for samples with $x=0.3$ and $x=0.5.$" @default.
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• W2015643886 date "2001-12-27" @default.
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• W2015643886 title "Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds<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>2</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>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:…" @default.
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• W2015643886 doi "https://doi.org/10.1103/physrevb.65.054402" @default.
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