Intrinsic BSCCO Josephson junctions on off-axis substrates

Anisotropic transport and microwave properties of intrinsic Bi2Sr2CaCu2Ox(2 212) Josephson junctions fabricated on off-axis substrates were studied. Th e twin-free thin film 2212 Josephson junctions have been prepared by molecu lar beam epitaxy (MBE) on LaAlO3 (001) substrates tilted 6 degrees toward t he [110] direction, and were patterned into a line shape along [110] LaAlO3 with 20 mu m in width. We found that the anisotropy parameter gamma was in creased from 76 to 120 by the annealing at temperature of 320 - 350 degrees C in the MBE chamber. The coherent Josephson radiation from stacked 2212 i ntrinsic junctions and their modulation under applied magnetic field were o bserved at frequency f(REC)=1.7 GHz by using a nonresonant detection method . These results confirmed the occurrence of the mutual phase locking of the stacked series array of intrinsic junctions along the c-axis.