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Structural, Electronic and Magnetic Properties of a Few Nanometer-Thick Superconducting NdBa₂Cu₃O₇ Films

Moretti Sala, Marco; Salluzzo, Marco; Minola, Matteo; De Luca, Gabriella Maria; Dellea, Greta; Srot, Vesna; Wang, Yi; van Aken, Peter A.; Le Tacon, Matthieu; Keimer, Bernhard; Dallera, Claudia; Braicovich, Lucio; Ghiringhelli, Giacomo

Abstract (englisch):
Abstract: Epitaxial films of high critical temperature (Tc) cuprate superconductors preserve
their transport properties even when their thickness is reduced to a few nanometers. However,
when approaching the single crystalline unit cell (u.c.) of thickness, Tc decreases and eventually,
superconductivity is lost. Strain originating from the mismatch with the substrate, electronic
reconstruction at the interface and alteration of the chemical composition and of doping can be
the cause of such changes. Here, we use resonant inelastic x-ray scattering at the Cu L3 edge to study
the crystal field and spin excitations of NdBa2Cu3O7􀀀x ultrathin films grown on SrTiO3, comparing
1, 2 and 80 u.c.-thick samples. We find that even at extremely low thicknesses, the strength of the
in-plane superexchange interaction is mostly preserved, with just a slight decrease in the 1 u.c. with
respect to the 80 u.c.-thick sample. We also observe spectroscopic signatures for a decrease of the
hole-doping at low thickness, consistent with the expansion of the c-axis lattice parameter and oxygen
deficiency in the chains of the first unit cell, determined by high-resolution transmission microscopy
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Verlagsausgabe §
DOI: 10.5445/IR/1000118694
Veröffentlicht am 28.04.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 24.04.2020
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000118694
HGF-Programm 43.21.01 (POF III, LK 01)
Quantum Correlations in Condensed Matter
Erschienen in Nanomaterials
Band 10
Heft 4
Seiten Article: 817
Vorab online veröffentlicht am 21.04.2020
Schlagwörter unit cell-thick films; superconductivity; resonant inelastic x-ray scattering
Nachgewiesen in Scopus
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