Abstract

The Josephson effect between a single crystal CeTIn5 (T=Co, Ir) and an s-wave superconductor has been investigated for CeTIn5–Cu–Nb junctions. Josephson critical current Ic is observed just below superconducting transition temperature Tc for CeCoIn5, while the temperature below which Ic appears varies from junction to junction and Ic rises gradually at first for CeIrIn5, probably reflecting a distribution of the local transition temperature in CeIrIn5.

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