  We have investigated the pressure effect on the newly discovered samarium
doped La1-xSmxO0.5F0.5BiS2 superconductors. More than threefold increase in Tc
(10.3 K) is observed with external pressure (at ~1.74 GPa at a rate of 4.08
K/GPa)) for x = 0.2 composition. There is a concomitant large improvement in
the quality of the superconducting transition. Beyond this pressure Tc
decreases monotonously at the rate of -2.09 K/GPa. In the x = 0.8 sample, we do
not observe any enhancement in Tc with application of pressure (up to 1.76
GPa). The semiconducting behavior observed in the normal state resistivity of
both of the samples is significantly subdued with the application of pressure
which, if interpreted invoking thermal activation process, implies that the
activation energy gap of the carriers is significantly reduced with pressure.
We believe these observations should generate further interest in the
La1-xSmxO0.5F0.5BiS2 superconductors.
