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Abstract
Electrical and magnetic properties were studied for the Y1−xPrxBa2Cu3O7−δ superconductors with x=0.44–0.48, which was located near the antiferromagnetic (AFM) and superconducting (SC) phase boundaries. An unconventional Kondo-like effect is observed below Tc for x=0.48, where the value of the resistivity minimum ρmin increases with increasing magnetic field H. The transition temperature Tmin first increases and then decreases with increasing field strength. Magnetic measurements show that a small fraction of FM phase appears and coexists with the SC and AFM phases. We discuss these findings from the viewpoints of Kondo scattering and electron-electron interaction, and found that the resistivity minimum below Tc is mainly due to the Kondo scattering. The Kondo scattering is identified as SC phase coexisting with AFM and FM clusters, which is as the Kondo singlets resulting from Pr substitution. This phase-separated state is unstable against the magnetic field which suppresses the SC phase and restores the single Kondo peak at low temperatures.
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