Angle-dependent Magnetoresistance of an Ordered Bose Glass of Vortices in YBa₂Cu₃O_7-δ Thin Films with a Periodic Pinning Lattice

Author(s)

Bernd Aichner, Lucas Backmeister, Max Karrer, Katja Wurster, Reinhold Kleiner, Edward Goldobin, Dieter Koelle, Wolfgang Lang

Abstract

The competition between intrinsic disorder in superconducting YBa (Formula presented.) Cu (Formula presented.) O (Formula presented.) (YBCO) thin films and an ultradense triangular lattice of cylindrical pinning centers spaced at 30 nm intervals results in an ordered Bose glass phase of vortices. The samples were created by scanning the focused beam of a helium-ion microscope over the surface of the YBCO thin film to form columns of point defects where superconductivity was locally suppressed. The voltage–current isotherms reveal critical behavior and scale in the vicinity of the second-order glass transition. The latter exhibits a distinct peak in melting temperature ((Formula presented.)) vs. applied magnetic field ((Formula presented.)) at the magnetic commensurability field, along with a sharp rise in the lifetimes of glassy fluctuations. Angle-dependent magnetoresistance measurements in constant-Lorentz-force geometry unveil a strong increase in anisotropy compared to a pristine reference film where the density of vortices matches that of the columnar defects. The pinning is therefore, dominated by the magnetic-field component parallel to the columnar defects, exposing its one-dimensional character. These results support the idea of an ordered Bose glass phase.

Organisation(s)

Electronic Properties of Materials

External organisation(s)

Eberhard Karls Universität Tübingen

Journal

Condensed Matter

Volume

8

No. of pages

12

ISSN

2410-3896

DOI

https://doi.org/10.3390/condmat8020032

Publication date

03-2023

Peer reviewed

Yes

Austrian Fields of Science 2012

103033 Superconductivity, 210006 Nanotechnology, 103018 Materials physics, 103009 Solid state physics

Keywords

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/2b140574-e207-48d5-b8a5-b1659f38ed8c