Boosting superconductivity in ultrathin YBa2Cu3O7−δ films via nanofaceted substrates
Artikel i vetenskaplig tidskrift, 2026
In cuprate high-temperature superconductors the doping level is fixed during synthesis, hence the charge carrier density per CuO2 plane cannot be easily tuned by conventional gating, unlike in 2D materials. Strain engineering has recently emerged as a powerful tuning knob for manipulating the properties of cuprates, in particular charge and spin orders, and their delicate interplay with superconductivity. In thin films, additional tunability can be introduced by the substrate surface morphology, particularly nanofacets formed by substrate surface reconstruction. Here we show a remarkable enhancement of the superconducting onset temperature Tcon and the upper critical magnetic field Hc,2 in nanometer-thin YBa2Cu3O7−δ films grown on a substrate with a nanofaceted surface. We theoretically show that the enhancement is driven by electronic nematicity and unidirectional charge density waves, where both elements are captured by an additional effective potential at the interface between the film and the uniquely textured substrate. Our findings show a new paradigm in which substrate engineering can effectively enhance the superconducting properties of cuprates. This approach opens an exciting frontier in the design and optimization of high-performance superconducting materials.
Författare
Eric Wahlberg
RISE Research Institutes of Sweden
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Riccardo Arpaia
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Universita Ca' Foscari Venezia
Debmalya Chakraborty
Indian Institute of Science
Birla Institute of Technology and Science-Pilani
Uppsala universitet
Alexei Kalaboukhov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
David Vignolles
LCMI Laboratoire des Champs Magnetiques Intenses
Cyril Proust
LCMI Laboratoire des Champs Magnetiques Intenses
Annica M. Black-Schaffer
Uppsala universitet
Thilo Bauch
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Götz Seibold
Brandenburgische Technische Universität
Floriana Lombardi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
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Ämneskategorier (SSIF 2025)
Materialkemi
Oorganisk kemi
Den kondenserade materiens fysik
Infrastruktur
Myfab (inkl. Nanotekniklaboratoriet)
DOI
10.1038/s41467-025-67500-2
PubMed
41501025
Relaterade dataset
Boosting superconductivity in ultrathin YBa2Cu3O7−δ films via nanofaceted substrates [dataset]
DOI: https://doi.org/10.5281/zenodo.17578632.