Abstract
Abstract A tunneling study is performed on the surface of a normal-conducting copper oxide La 1.5 Ba 1.5 Cu 3 O 7−y (LBCO) in S(HoBa 2 Cu 3 O 7−y (HBCO))-N(LBCO) bi-layer system. Measured tunneling dI/dV curve has a gap-like structure. The peak-to-peak voltage 2Δ in the tunneling dI/dV curve exponentially decreases with increasing LBCO layer thickness. These facts suggest that a superconductivity is induced in the LBCO layer. The characteristic decay length ξ of Δ is 260±50 nm, which is two orders larger than the value expected from the conventional theory of the proximity effect.
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