Transport properties of ultra-thin granular YBa₂Cu₃O_7-δ nanobridges

Magneto-transport measurements in YBa₂Cu₃O₇ nanobridges, patterned on laser ablated ultra-thin films, reveal phenomena that are usually absent in the bulk of the material. These include broadening of the resistive transition, magnetoresistance oscillation, negative magnetoresistance at low fields, negative magnetoresistance slope at high fields, and V-I curves that exhibit voltage jumps at temperatures well below T_c. These phenomena, attributed to the granular nature of the bridges, should be taken into account in any future attempts to utilize such bridges in technological applications.