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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.10: Talk
Monday, March 27, 2023, 12:00–12:15, HSZ 103
Vortex matching at 6 T in YBa2Cu3O7−δ by imprinting an ultradense hexagonal pinning array with focused helium ion irradiation — •Bernd Aichner1, Lucas Backmeister1, Max Karrer2, Katja Wurster2, Christoph Schmid2, Reinhold Kleiner2, Edward Goldobin2, Dieter Koelle2, and Wolfgang Lang1 — 1Fakultät für Physik, Universität Wien, Wien, Österreich — 2Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, Tübingen, Deutschland
The focused beam of a helium ion microscope (HIM) is used to locally suppress superconductivity in thin films of the prototypical copper-oxide superconductor YBa2Cu3O7−δ (YBCO). In these pillar-shaped regions, the critical temperature Tc is reduced or entirely suppressed due to pair-breaking by point defects.
The narrow spacing of these nanopillars leads to vortex commensurability effects at high magnetic fields, which appear as pronounced maxima of the critical current and corresponding resistance minima. In accordance with the calculation, these effects appear at an unprecedented high magnetic field of 6 T in a hexagonal nanopillar lattice with 20 nm spacing. In contrast to previous observations, matching phenomena persist in the whole accessible temperature range, from the onset of superconductivity down to a temperature of 2 K. At the matching field, we observe a novel behavior in voltage-current isotherms, which we attribute to an ordered Bose glass phase. These results establish the HIM as a versatile platform for creating ultradense vortex pinning landscapes with complex designs in copper-oxide superconductors.