Nonlinear $I–V$ characteristics and proximity effects for $PrBa2Cu3O7−δ/YBa2Cu3O7−δ$ bilayered structures grown on (001) $YBa2Cu3O7−δ$ single crystal substrates Available to Purchase

We have observed superconductivity induced by proximity effects for 100 nm thick (001) $PrBa2Cu3O7−δ$ films pseudomorphically grown on (001) $YBa2Cu3O7−δ$ single crystal substrates by vertical four-probe measurements. The induced superconductivity disappeared around 28 K and was recovered at around 15 K. The 220 nm thick (001) $PrBa2Cu3O7−δ/YBa2Cu3O7−δ$ bilayers show nonlinear $I–V$ behavior with 0.2 mV built-in potential at low temperature below 50 K. The local maximum of the vertical resistance appears around 25 K.