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PrOFe0.9Co0.1As is known to be a superconductor with a TC of ~14 K. In anattempt to induce charge transfer and also induce chemical pressure between theFeAs and PrO layers we have synthesized for the first time oxypnictides of thetype PrOFe0.9Co0.1As1-xPx (P doping at As sites). All the compounds crystallizein the tetragonal ZrCuSiAs type structure (space group = P4/nmm). The latticeparameters (a and c) decrease as expected on substitution of smallerphosphorous at the arsenic site in PrOFe0.9Co0.1As and a decrease in TC wasobserved on substitution of P ions at a low rate of 0.13K/at. % of P for x >0.1. The irreversibility field (Hirr) and critical current density (JC),obtained using the AC susceptibility measurements was found to decreasemonotonically with increasing 'P' concentration. 'Hirr' is observed to be muchsmaller than HC2, pointing to a very low pinning energy. The pinning potentialobtained using both in-field transport and AC susceptibility measurementsindicate a low value of ~40 meV and show no significant variation with Psubstitution.

Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping