Ferromagnetic signal and unconventional Kondo-like effect in the superconducting Y1−xPrxBa2Cu3O7−δ systems
作者： Guixin Cao , Yuanyuan Li , Jincang Zhang , Shixun Cao , Chuanbing Cai
DOI: 10.1063/1.3393941
关键词: Kondo insulator 、 Antiferromagnetism 、 Condensed matter physics 、 High-temperature superconductivity 、 Ferromagnetism 、 Field strength 、 Materials science 、 Superconductivity 、 Kondo effect 、 Scattering
摘要: Electrical and magnetic properties were studied for the Y1−xPrxBa2Cu3O7−δ superconductors with x=0.44–0.48, which was located near antiferromagnetic (AFM) superconducting (SC) phase boundaries. An unconventional Kondo-like effect is observed below Tc x=0.48, where value of resistivity minimum ρmin increases increasing field H. The transition temperature Tmin first then decreases strength. Magnetic measurements show that a small fraction FM appears coexists SC AFM phases. We discuss these findings from viewpoints Kondo scattering electron-electron interaction, found mainly due to scattering. identified as coexisting clusters, singlets resulting Pr substitution. This phase-separated state unstable against suppresses restores ...
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