Abstract
We investigated the magnetic torque of superconducting PrFeAsO1−δ single crystal using the torque magnetometer at temperatures from 2K to 200K in magnetic field of 30kG. The torque curve tends to have a singular shape compared to other superconductors. The analyses of the PrFeAsO1−δ torque curves by the single-band and the multi-band Kogan model yield 3<γλ<5 in 30kG. With the aid of the multi-band Kogan model, however, we obtain γξ=0.79±0.01 and γλ=19±3 in 30kG at 20.5K. The smallness of γξ(<1) thus obtained is due to the multi-band nature of the iron pnictide.
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