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We report appearance of superconductivity at 5K in NdO0.5F0.5BiS2 andsupplement the discovery [1] of the same in layered sulfide based ZrCuSiAs typecompounds. The bulk polycrystalline compound is synthesized by conventionalsolid state route via vacuum encapsulation technique. Detailed structuralanalysis showed that the studied compound is crystallized in tetragonal P4/nmmspace group with lattice parameters a = 3.9911(3) {\AA}, c = 13.3830(2) {\AA}.Bulk superconductivity is established in NdO0.5F0.5BiS2 at 5K by both transportand magnetic measurements. Electrical transport measurements showedsuperconducting Tc onset at 5.2K and Tc ({\rho}=0) at 4.7K. Under appliedmagnetic field both Tc onset and Tc ({\rho} =0) decrease to lower temperaturesand an upper critical field [Hc2(0)] of above 23kOe is estimated. Both AC andDC magnetic susceptibility measurements showed bulk superconductivity below 5K.Isothermal magnetization (MH) exhibited typical type II behavior with lowercritical field (Hc1) of around 15Oe. Isothermal magnetization (MH) exhibitedtypical type-II behavior with lower critical field (Hc1) of around 15Oe.Specific heat [Cp(T)] is investigated in the temperature range of 1.9-50K inzero external magnetic field. A Schottky-type anomaly is observed at lowtemperature below 7K. This low temperature Schottky can be attributed to thechange in the entropy of the system.

Superconductivity at 5K in NdO0.5F0.5BiS2