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We investigate the external hydrostatic pressure effect on the superconducting transition temperature ( T  c ) of new layered superconductors Bi 4 O 4 S 3  and NdO 0.5 F 0.5 BiS 2 . Though the  T  c  is found to have a moderate decrease from 4.8 K to 4.3 K (d T  c  onset /d P  = –0.28 K/GPa) for Bi 4 O 4 S 3  superconductor, the same increases from 4.6 K to 5 K (d T  c  onset /d P  = 0.44 K/GPa) up to 1.31 GPa followed by a sudden decrease from 5 K to 4.7 K up to 1.75 GPa for NdO 0.5 F 0.5 BiS 2  superconductor. The variation of  T  c  in these systems may be correlated to an increase or decrease of the charge carriers in the density of states under externally applied pressure. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Hydrostatic pressure effect on T c of new BiS 2 ‐based Bi 4 O 4 S 3 and NdO 0.5 F 0.5 BiS 2 layered superconductors