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The defect-rich morphology of YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ (YBCO) thinfilms leads to a glass-like arrangement of Abrikosov vortices which causes theresistance to disappear in vanishing current densities. This vortex glassconsists of entangled vortex lines and is identified by a characteristicscaling of the voltage-current isotherms. Randomly distributed columnar defectsstratify the vortex lines and lead to a Bose glass. Here, we report on theobservation of an ordered Bose glass in a YBCO thin film with a hexagonal arrayof columnar defects with 30 nm spacings. The periodic pinning landscape wasengineered by a focused beam of 30 keV He$^+$ ions in a helium-ion microscope.

nanomaterials

Ordered Bose Glass of Vortices in Superconducting  YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ Thin Films with a Periodic Pin Lattice  Created by Focused Helium Ion Irradiation