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$^{121,123}Sb$ nuclear quadrupole resonance (NQR) was applied to$Fe(Sb_{1-x}Te_x)_2$ in the low doping regime (\emph{x = 0, 0.01} and\emph{0.05}) as a microscopic zero field probe to study the evolution of\emph{3d} magnetism and the emergence of metallic behavior. Whereas the NQRspectra itself reflects the degree of local disorder via the width of theindividual NQR lines, the spin lattice relaxation rate (SLRR) $1/T_1(T)$ probesthe fluctuations at the $Sb$ - site. The fluctuations originate either fromconduction electrons or from magnetic moments. In contrast to the semi metal$FeSb_2$ with a clear signature of the charge and spin gap formation in$1/T_1(T)T ( \sim exp/ (\Delta k_BT) ) $, the 1\% $Te$ doped system exhibitsalmost metallic conductivity and a almost filled gap. A weak divergence of theSLRR coefficient $1/T_1(T)T \sim T^{-n} \sim T^{-0.2}$ points towards thepresence of electronic correlations towards low temperatures wheras the\textit{5\%} $Te$ doped sample exhibits a much larger divergence in the SLRRcoefficient showing $1/T_1(T)T \sim T^{-0.72} $. According to the specific heatdivergence a power law with $n\ =\ 2\ m\ =\ 0.56$ is expected for the SLRR.Furthermore $Te$-doped $FeSb_2$ as a disordered paramagnetic metal might be aplatform for the electronic Griffith phase scenario. NQR evidences asubstantial asymmetric broadening of the $^{121,123}Sb$ NQR spectrum for the\emph{5\%} sample. This has purely electronic origin in agreement with theelectronic Griffith phase and stems probably from an enhanced $Sb$-$Te$ bondpolarization and electronic density shift towards the $Te$ atom inside$Sb$-$Te$ dumbbell.

physical review. b./physical review. b

121,123Sb NQR as a microscopic probe in Te doped correlated semimetal  FeSb2 : emergence of electronic Griffith phase, magnetism and metallic  behavior %