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We report synthesis and superconductivity at 3.7K in PrO0.5F0.5BiS2. Thenewly discovered material belongs to the layered sulfide based REO0.5F0.5BiS2compounds having ZrCuSiAs type structure. The bulk polycrystalline compound issynthesized by vacuum encapsulation technique at 7800C in single step. Detailedstructural analysis has shown that the as synthesized PrO0.5F0.5BiS2 iscrystallized in tetragonal P4/nmm space group with lattice parameters a =4.015(5) {\AA}, c = 13.362(4) {\AA}. Bulk superconductivity is observed inPrO0.5F0.5BiS2 below 4K from magnetic and transport measurements. Electricaltransport measurements showed superconducting transition temperature (Tc) onsetat 3.7K and Tc ({\rho}=0) at 3.1K. Hump at Tc related to superconductingtransition is not observed in heat capacity measurement and rather aSchottky-type anomaly is observed at below ~6K. The compound is slightlysemiconducting in normal state. Isothermal magnetization (MH) exhibited typicaltype II behavior with lower critical field (Hc1) of around 8Oe.

Synthesis and superconductivity of new BiS2 based superconductor PrO0.5F0.5BiS2