We investigated the magnetic torque of superconducting PrFeAsO 1 δ single crystal using the torque magnetometer at temperatures from 2 K to 200 K in magnetic field of 30 kG. 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 30 kG. With the aid of the multi-band Kogan model, however, we obtain γλ = 0.79 ± 0.01 and γλ = 19 ± 3 in 30 kG at 20.5 K. The smallness of γ ζ(<1) thus obtained is due to the multi-band nature of the iron pnictide.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering