A high-quality PrFeAsO 1−δ single crystal (T c = 44 K) has been investigated by the magnetic torque. Antiferromagnetism of the Pr 3+ ions was found to coexist with superconductivity in PrFeAsO 1−δ at temperatures below T N = 14 K. We predict a magnetic structure that is not in accordance with earlier neutron studies performed using polycrystalline nonsuperconducting specimens. As the temperature decreases, the superconducting anisotropy γ ∼ 4 of PrFeAsO 1−δ increases near T c and tends to decrease slightly at lower temperatures.

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