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In order to investigate physical properties around a ferromagnetic (FM)quantum transition point and a tricritical point (TCP) in theitinerant-electron metamagnetic compound UCoAl, we have performed the $^{59}$Conuclear quadrupole resonance (NQR) measurement for the Fe-substitutedU(Co$_{1-x}$Fe$_x$)Al ($x$ = 0, 0.5, 1, and 2%) in zero external magneticfield. The Fe concentration dependence of $^{59}$Co-NQR spectra at lowtemperatures indicates that the first-order FM transition occurs at least above$x$ = 1%. The magnetic fluctuations along the $c$ axis detected by the nuclearspin-spin relaxation rate $1/T_2$ exhibit an anomaly at $T_\mathrm{max}$ $\sim$20 K and enhance with increasing $x$. These results are in good agreement withtheoretical predictions and indicate the presence of prominent criticalfluctuations at the TCP in this system.

Ferromagnetic Critical Behavior in U(Co$_{1-x}$Fe$_x$)Al ($0 \leq x \leq 0.02$) Studied by $^{59}$Co Nuclear Quadrupole Resonance Measurement