Abstract
Single crystals of oxygen deficient oxypnictide superconductor PrFeAsO1−y have been grown by using belt-type anvil high-pressure synthesis apparatus. Superconducting transition temperature (Tc) of the obtained single crystal is 45K, and typical size is about 800×1000×30μm3. In-plane electrical resistivity shows s-shaped behavior, and can well be fitted by T1.2 temperature dependence near 150K. In addition, we obtained non-superconducting parent single crystal by annealing the as-grown single crystal under ambient pressure. Resistivity of parent single crystal is characterized by the kink near 150K corresponding to the structural transition, and the structure near 12K, which is thought to be originating from the magnetic order of Pr ion.
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