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@ARTICLE{Lyatti:1022216,
      author       = {Lyatti, Matvey and Gundareva, Irina and Röper, Torsten and
                      Popovic, Zorica and Jalil, Abdur Rehman and Grützmacher,
                      Detlev and Schäpers, Thomas},
      title        = {{Q}uantum size effects in ultra-thin {YB}a2{C}u3{O}7-x
                      films},
      reportid     = {FZJ-2024-01337},
      year         = {2023},
      note         = {Supplementary Information is updated},
      abstract     = {The d-wave symmetry of the order parameter with zero energy
                      gap in nodal directions stands in the way of using
                      high-temperature superconductors for quantum applications.
                      We investigate the symmetry of the order parameter in
                      ultra-thin YBa2Cu3O7-x (YBCO) films by measuring the
                      electrical transport properties of nanowires and
                      nanoconstrictions aligned at different angles relative to
                      the main crystallographic axes. The anisotropy of the
                      nanowire critical current in the nodal and antinodal
                      directions reduces with the decrease in the film thickness.
                      The Andreev reflection spectroscopy shows the presence of a
                      thickness-dependent energy gap that doesn't exist in bulk
                      YBCO. We find that the thickness-dependent energy gap
                      appears due to the quantum size effects in ultra-thin YBCO
                      films that open the superconducting energy gap along the
                      entire Fermi surface. The fully gapped state of the
                      ultra-thin YBCO films makes them a very promising platform
                      for quantum applications, including quantum computing and
                      quantum communications.},
      cin          = {PGI-9 / PGI-10},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / I:(DE-Juel1)PGI-10-20170113},
      pnm          = {5222 - Exploratory Qubits (POF4-522) / DFG project
                      390534769 - EXC 2004: Materie und Licht für
                      Quanteninformation (ML4Q) (390534769)},
      pid          = {G:(DE-HGF)POF4-5222 / G:(GEPRIS)390534769},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2304.03591},
      howpublished = {arXiv:2304.03591},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2304.03591;\%\%$},
      doi          = {10.34734/FZJ-2024-01337},
      url          = {https://juser.fz-juelich.de/record/1022216},
}