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The evolution of the electronic state through the reduction annealing hasbeen investigated in electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10)single crystals with the so-called T' structure. From the ab plane and c axiselectrical resistivity measurements in magnetic fields, it has been found that,through the reduction annealing, the strongly localized state of carriersaccompanied by the antiferromagnetic (AF) pseudogap in the as-grown crystalchanges to a metallic state bringing about the Kondo effect without AFpseudogap and to a superconducting state. These results are able to beunderstood in terms of a model based on the strong electron correlation. Thecomplete removal of excess oxygen in the T'-cuprates is expected to result inthe appearance of superconductivity in a wide range of the Ce concentrationincluding the parent compound of x=0.

journal of the physical society of japan

Evolution of the electronic state through the reduction annealing in  electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10) single crystals:  Antiferromagnetism, Kondo effect and superconductivity