Magnetoresistance of aYBa2Cu3O7Corbino disk: Probing geometrical contributions to the unconventional normal-state magnetoresistance of high-temperature superconductors

Abstract

Complementary measurements of geometrical effects in the normal-state magnetoresistance of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$ thin films, patterned into a Corbino disk, a square, and a strip-shaped sample, are reported. We observe a difference between the Corbino and strip-sample magnetoresistances, which arises from bending of the current trajectories in the transverse magnetic field and equals the square of the Hall angle in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}.$ This geometrical magnetoresistance component vanishes when the magnetic field is oriented parallel to the film. The geometrical magnetoresistance has also been found to be significant in square-shaped samples, and thus, has to be considered in magnetoresistance measurements of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$ single crystals.