Transport properties of ultra-thin granular YBa2Cu3O7−δ nanobridges

• Nano bridges were patterned on laser ablated ultra-thin YBa2Cu3O7 films.
• Magneto-transport measurements reveal phenomena that are usually absent in the bulk.
• Magnetoresistance (MR) oscillation point to effect of granularity.
• Negative MR at low fields and negative MR slope at high fields were observed.
• V-I curves exhibit voltage jumps at temperatures well below Tc.

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 Tc. 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.