Radiation from Intrinsic Josephson Junctions in Misaligned Tl2Ba2CaCu2O8 Thin Films

Abstract

We measure the current-voltage (I-V) curves of intrinsic Josephson junctions (IJJs) in misaligned Tl 2 Ba 2 Ca Cu 2 O 8 thin films embedded in a Fabry-Pérot (F-P) resonator at liquid nitrogen temperature. Regarding the substrate as a dielectric resonator, electromagnetic coupling between the intrinsic Josephson junctions is improved. By adjusting the location of the substrate in the F-P resonator, the critical current of the IJJs under microwave irradiation (75.6 GHz) is suppressed almost to zero. Two pairs of symmetrical radiation (75.6 GHz) peaks are detected. Possible explanations for this experimental result are discussed.

Energy gap suppression and excess current in Tl2Ba2CaCu2O8intrinsic Josephson junctions

“…[9,10] Based on the SIS model, it is estimated that there are about 827 IJJs in the microbridge. [11,12] The IVCs of the IJJs at different T are shown in Fig. 3.…”

Transport properties of Tl2Ba2CaCu2O8 microbridges on a low-angle step substrate

“…Tl-2212 has an operating temperature over 100 K, [15] which is much higher than that of BSCCO and YBa 2 Cu 3 O 7−δ (YBCO). Intrinsic Josephson effects and other superconducting properties of Tl-2212 IJJs were mostly investigated on misaligned substrate, [16][17][18][19][20][21][22][23][24][25][26][27][28] in which films were grown epitaxially on the substrate with the same misalignment angle. In this structure, the copper oxide planes of Tl-based films create a misaligned angle with respect to the substrate surface, the superconducting current can then flow through the inter-plane along the c-axis of the sample films according to the experimental design.…”