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Effect of Sr doping on the magnetic exchange interactions in manganites of type <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">L</mml:mi><mml:msub><mml:mi mathvariant="normal">a</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:msub><mml:mi mathvariant="normal">r</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">M</mml:mi><mml:msub><mml:mi …
Strontium doping transforms manganites of type $\mathrm{L}{\mathrm{a}}_{1\ensuremath{-}x}\mathrm{S}{\mathrm{r}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ from an insulating antiferromagnet $(x=0)$ to a metallic ferromagnet $(x>0.16)$ due to the induced charge carriers (holes). Neutron scattering experiments were employed to investigate the effect of Sr doping on a tailor-made compound of composition $\mathrm{L}{\mathrm{a}}_{0.7}\mathrm{S}{\mathrm{r}}_{0.3}\mathrm{M}{\mathrm{n}}_{0.1}\mathrm{T}{\mathrm{i}}_{0.3}\mathrm{G}{\mathrm{a}}_{0.6}{\mathrm{O}}_{3}$. By the simultaneous doping with $\mathrm{S}{\mathrm{r}}^{2+}$ and …