Effect of pressure on normal and superconducting state properties of iron based superconductor PrFeAsO_0.6F _y (y?=?0.12, 0.14).

ABSTRACT: The effect of high pressure (up to 8?GPa) on normal and superconducting state properties of PrFeAsO_0.6F_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_0.6F_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_0.6F_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_0.6F_0.12.

SUBMITTER: Arumugam S 

PROVIDER: S-EPMC5601470 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature