  By using a hydrothermal method, we have successfully grown crystals of the
newly discovered superconductor FeS, which has an isostructure of the iron
based superconductor FeSe. The superconductivity appears at about 4.5K, as
revealed by both resistive and magnetization measurements. It is found that the
upper critical field is relatively low, with however an rather large anisotropy
$\Gamma=[(dH_{c2}^{ab}/dT)/(dH_{c2}^{c}/dT)]_{T_c}\approx5.8$. A huge
magnetoresistivity (290$\%$ at 9T and 10K, ${H}$ $\parallel$ c-axis) together
with a non-linear behavior of Hall resistivity vs. external field are observed.
A two-band model is applied to fit the magnetoresistance and non-linear
transverse resistivity, yielding the basic parameters of the electron and hole
bands.

Superconductivity