Alternating current Josephson effect in intrinsic Josephson bridges in Tl2Ba2CaCu2O8 thin films

We have performed transport measurements on bridges patterned in misaligned thin films of the superconductor Tl2Ba2CaCu2O8. There is a c-axis componen t of current flow along the bridge, giving rise to hysteretic Josephson-lik e current-voltage curves. The temperature dependence of the critical curren t follows the Ambegaokar-Baratoff theory with IcRN up to 26 mV at 4.2 K. Mi crowave emission from the Josephson junctions near T-c (approximate to 103 K) has been detected using an X-band detector. We show that 700 +/- 15 junc tions in the bridge are actively oscillating, confirming that the junctions are "intrinsic" junctions formed by adjacent copper oxide planes in the Tl 2Ba2CaCu2O8 crystal structure. (C) 2000 American Institute of Physics. [S00 03-6951(00)04924-X].