We have observed superconductivity induced by proximity effects for 100 nm thick (001)PrBa2Cu3O7−&dgr;films pseudomorphically grown on (001)YBa2Cu3O7−&dgr;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−&dgr;/YBa2Cu3O7−&dgr;bilayers show nonlinearI–Vbehavior with 0.2 mV built-in potential at low temperature below 50 K. The local maximum of the vertical resistance appears around 25 K. ©1998 American Institute of Physics.