Substrate influence on low energy electron beam processing of YBa2Cu3O7−δ thin films

Guy Bareli, Štefan Chromik, Carlo Camerlingo, Marcel Talacko, Alica Rosová, Marianna Španková, Vladimír Štrbík, Michaela Sojková, Grzegorz Jung

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The influence of substrate material on electron writing (EW) procedures directed at fabrication of artificial channels for easy vortex motion in YBa2Cu3O7−δ (YBCO) epitaxial thin films has been investigated. Films deposited on two types of substrates providing epitaxial growth, magnesium oxide (MgO) and La0.18Sr0.82Al0.59Ta0.41O3 (LSAT) substrates, have been irradiated in a standard electron transmission microscope with low and high fluency 30 keV electrons. The effects of irradiation have been assessed by the measurements of the superconducting transition temperature and the critical current, completed by the micro-Raman spectroscopy and transmission electron microscopy structural investigations. The irradiation effects were found to depend on the type of substrate on which films were deposited. Differences have been attributed to distinct structural properties of the films, resulting from different matching of substrates lattices to the YBCO crystalline lattice. A stronger mismatch of MgO substrates causes the formation of in-plane disoriented epitaxial grains and significant heat confinement during EW procedures. Heat confinement mechanism, together with differences in the thermal properties of the substrates enables understanding the performance of different YBCO films in electron writing procedures.

Original languageEnglish
Article number147624
JournalApplied Surface Science
Volume535
DOIs
StatePublished - 1 Jan 2021

Keywords

  • Electron radiation defects
  • Heat confinement
  • High-Tc films
  • Micro-Raman spectroscopy

ASJC Scopus subject areas

  • Chemistry (all)
  • Condensed Matter Physics
  • Physics and Astronomy (all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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