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The effect of high pressure (up to 8 GPa) on normal and superconducting state properties of PrFeAsO 0.6 F 0.12 , an 1111-type iron based superconductor close to optimal doped region, has been investigated by measuring the temperature dependence of resistivity. Initially, the superconducting transition temperature ( T    c  ) is observed to increase slowly by about 1 K as pressure ( P ) increases from 0 to 1.3 GPa. With further increase in pressure above 1.3 GPa,  T    c   decreases at the rate of ~1.5 K/GPa. The normal-state resistivity decreases monotonically up to 8 GPa. We have also measured the pressure dependence of magnetization ( M ) on the same piece of PrFeAsO 0.6 F 0.12  sample up to 1.1 GPa and observed  T    c   as well as the size of the Meissner signal to increase with pressure in this low-pressure region. In contrast, for an over-doped PrFeAsO 0.6 F 0.14  sample, magnetization measurements up to 1.06 GPa show that both  T    c   and the Meissner signal decrease with pressure. The present study clearly reveals two distinct regions in the dome-shaped ( T    c  - P ) phase diagram of PrFeAsO 0.6 F 0.12 .

Effect of pressure on normal and superconducting state properties of iron based superconductor PrFeAsO0.6F y (y = 0.12, 0.14)