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Magnetic dc susceptibility ($\chi$) and electron spin resonance (ESR)measurements in the paramagnetic regime, are presented. We found a Curie-Weiss(CW) behavior for $\chi$(T) with a ferromagnetic $\Theta = 446(5)$ K and$\mu_{eff} = 4.72(9) \mu_{B}/f.u.$, this being lower than that expected foreither $Fe^{3+}(5.9\mu_{B})$ or $Fe^{2+}(4.9\mu_{B})$ ions. The ESR g-factor $g= 2.01(2)$, is associated with $Fe^{3+}$. We obtained an excellent descriptionof the experiments in terms of two interacting sublattices: the localized$Fe^{3+}$ ($3d^{5}$) cores and the delocalized electrons. The coupled equationswere solved in a mean-field approximation, assuming for the itinerant electronsa bare susceptibility independent on $T$. We obtained $\chi_{e}^{0} = 3.7$$10^{-4}$ emu/mol. We show that the reduction of $\mu_{eff}$ for $Fe^{3+}$arises from the strong antiferromagnetic (AFM) interaction between the twosublattices. At variance with classical ferrimagnets, we found that $\Theta$ isferromagnetic. Within the same model, we show that the ESR spectrum can bedescribed by Bloch-Hasegawa type equations. Bottleneck is evidenced by theabsence of a $g$-shift. Surprisingly, as observed in CMR manganites, nonarrowing effects of the ESR linewidth is detected in spite of the presence ofthe strong magnetic coupling. These results provide evidence that the magneticorder in $Sr_{2}FeMoO_{6}$ does not originates in superexchange interactions,but from a novel mechanism recently proposed for double perovskites

physical review. b, condensed matter

Evidence of strong antiferromagnetic coupling between localized and itinerant electrons in ferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</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">FeMoO</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Evidence of strong antiferromagnetic coupling between localized and itinerant electrons in ferromagneticSr2FeMoO6