  We study the impact of hydrostatic pressure on superconductivity of new BiS2
based layered REO0.5F0.5BiS2 (RE-La, Pr, and Nd) compounds through the
measurements of dc electrical resistivity. The REO0.5F0.5BiS2 (RE-La, Pr and
Nd) compounds synthesized by solid state reaction route via vacuum
encapsulation are crystallized in the tetragonal P4/nmm space group. At ambient
pressure the superconducting transition onset temperatures are 2.7K, 3.5K and
4.5K which are enhanced substantially under external hydrostatic pressure to
10.5K, 7.8K and 7.5K for LaO0.5F0.5BiS2, PrO0.5F0.5BiS2 and NdO0.5F0.5BiS2
respectively at 1.68GPa. The normal state electrical resistivity decreases with
applied pressure for REO0.5F0.5BiS2 (RE-La, Pr and Nd). The electrical
resistivity under magnetic field and applied pressure has been measured to
estimate upper critical field, the values of which are 15.9Tesla, 8.8Tesla and
8.2Tesla for LaO0.5F0.5BiS2, PrO0.5F0.5BiS2 and NdO0.5F0.5BiS2 compounds.
Substantial enhancement of superconductivity under moderate pressures in
studied new BiS2 based superconductors call for the attention of condensed
matter physics community.
