  We present measurements of the superconducting critical temperature Tc and
upper critical field Hc2 as a function of pressure in the transition metal
dichalcogenide 2H-NbS2 up to 20 GPa. We observe that Tc increases smoothly from
6K at ambient pressure to about 8.9K at 20GPa. This range of increase is
comparable to the one found previously in 2H-NbSe2. The temperature dependence
of the upper critical field Hc2(T) of 2H-NbS2 varies considerably when
increasing the pressure. At low pressures, Hc2(0) decreases, and at higher
pressures both Tc and Hc2(0) increase simultaneously. This points out that
there are pressure induced changes of the Fermi surface, which we analyze in
terms of a simplified two band approach.
