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We report the critical current density Jc in KxFe2-ySe2-zSz crystals. The Jccan be enhanced significantly with optimal S doping (z=0.99). ForK0.70(7)Fe1.55(7)Se1.01(2)S0.99(2), the weak fishtail effect is found for H||c.The normalized vortex pinning forces follow the scaling law with a maximumposition at 0.41 of the reduced magnetic field. These results demonstrate thatthe small size normal point defects dominate the vortex pinning mechanism.

Critical current density and mechanism of vortex pinning in KxFe2-ySe2 doped with S