001022216 001__ 1022216
001022216 005__ 20240226075435.0
001022216 0247_ $$2arXiv$$aarXiv:2304.03591
001022216 0247_ $$2datacite_doi$$a10.34734/FZJ-2024-01337
001022216 037__ $$aFZJ-2024-01337
001022216 041__ $$aEnglish
001022216 1001_ $$0P:(DE-Juel1)180691$$aLyatti, Matvey$$b0$$eCorresponding author
001022216 245__ $$aQuantum size effects in ultra-thin YBa2Cu3O7-x films
001022216 260__ $$c2023
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001022216 520__ $$aThe d-wave symmetry of the order parameter with zero energy gap in nodal directions stands in the way of using high-temperature superconductors for quantum applications. We investigate the symmetry of the order parameter in ultra-thin YBa2Cu3O7-x (YBCO) films by measuring the electrical transport properties of nanowires and nanoconstrictions aligned at different angles relative to the main crystallographic axes. The anisotropy of the nanowire critical current in the nodal and antinodal directions reduces with the decrease in the film thickness. The Andreev reflection spectroscopy shows the presence of a thickness-dependent energy gap that doesn't exist in bulk YBCO. We find that the thickness-dependent energy gap appears due to the quantum size effects in ultra-thin YBCO films that open the superconducting energy gap along the entire Fermi surface. The fully gapped state of the ultra-thin YBCO films makes them a very promising platform for quantum applications, including quantum computing and quantum communications.
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001022216 65027 $$0V:(DE-MLZ)SciArea-120$$2V:(DE-HGF)$$aCondensed Matter Physics$$x0
001022216 65017 $$0V:(DE-MLZ)GC-2004-2016$$2V:(DE-HGF)$$aBasic research$$x0
001022216 7001_ $$0P:(DE-Juel1)144210$$aGundareva, Irina$$b1
001022216 7001_ $$0P:(DE-HGF)0$$aRöper, Torsten$$b2
001022216 7001_ $$0P:(DE-HGF)0$$aPopovic, Zorica$$b3
001022216 7001_ $$0P:(DE-Juel1)171826$$aJalil, Abdur Rehman$$b4
001022216 7001_ $$0P:(DE-Juel1)125588$$aGrützmacher, Detlev$$b5
001022216 7001_ $$0P:(DE-Juel1)128634$$aSchäpers, Thomas$$b6
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001022216 9101_ $$0I:(DE-HGF)0$$6P:(DE-HGF)0$$a University of Belgrade$$b3
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001022216 9141_ $$y2023
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