  We report the discovery of superconductivity and detailed normal-state
physical properties of RbV3Sb5 single crystals with V kagome lattice. RbV3Sb5
single crystals show a superconducting transition at Tc ~ 0.92 K. Meanwhile,
resistivity, magnetization and heat capacity measurements indicate that it
exhibits anomalies of properties at T* ~ 102 - 103 K, possibly related to the
formation of charge ordering state. When T is lower than T*, the Hall
coefficient RH undergoes a drastic change and sign reversal from negative to
positive, which can be partially explained by the enhanced mobility of
hole-type carriers. In addition, the results of quantum oscillations show that
there are some very small Fermi surfaces with low effective mass, consistent
with the existence of multiple highly dispersive Dirac band near the Fermi
energy level.
