  Density fluctuations near the QCD critical point can be probed via an
intermittency analysis in relativistic heavy-ion collisions. We report the
first measurement of intermittency in Au$+$Au collisions at
$\sqrt{s_\mathrm{_{NN}}}$ = 7.7-200 GeV measured by the STAR experiment at the
Relativistic Heavy Ion Collider (RHIC). The scaled factorial moments of
identified charged hadrons are analyzed at mid-rapidity and within the
transverse momentum phase space. We observe a power-law behavior of scaled
factorial moments in Au$+$Au collisions and a decrease in the extracted scaling
exponent ($\nu$) from peripheral to central collisions. The $\nu$ is consistent
with a constant for different collisions energies in the mid-central (10-40\%)
collisions. Moreover, the $\nu$ in the 0-5\% most central Au$+$Au collisions
exhibits a non-monotonic energy dependence that reaches a possible minimum
around $\sqrt{s_\mathrm{_{NN}}}$ = 27 GeV. The physics implications on the QCD
phase structure are discussed.
