SUPERCONDUCTING PROPERTIES OF ION-BEAM MODIFIED YBCO MICROBRIDGES

We prepared ion beam modified microbridges based on thin sputtered or laser ablated YBCO films on SrTiO3 substrates. The microbridges with a width of 10 mu m were irradiated through slits in a 700 nm thick doub le layer resist mask. in our experiments we used O+ ions with an ion e nergy of 30 ke V or 100 kE V varying the dose between 10(13) ions . cm (-2) and 10(14) ions cm(-2). We investigated the influence of film thi ckness and slit width on the superconducting properties of these junct ions. We show the temperature dependence of the junctions properties o n microwave radiation or external magnetic fields.