Next Article in Journal
Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes
Next Article in Special Issue
Structural Study of Nano-Sized Gahnite (ZnAl2O4): From the Average to the Local Scale
Previous Article in Journal
Ab-Initio Study of the Electronic and Magnetic Properties of Boron- and Nitrogen-Doped Penta-Graphene
Previous Article in Special Issue
Effects of Nanodomains on Local and Long-Range Phase Transitions in Perovskite-Type Eu0.8Ca0.2TiO3–δ
Open AccessArticle

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

1
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
2
CNR-SPIN, Complesso Monte Sant’Angelo-Via Cinthia, I-80126 Napoli, Italy
3
Max Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
4
Dipartimento di Fisica “E. Pancini”, Università Degli Studi di Napoli “Federico II”, Complesso Monte Sant’Angelo-Via Cinthia, I-80126 Napoli, Italy
5
Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Hermann-v.-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
6
CNR-SPIN, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2020, 10(4), 817; https://doi.org/10.3390/nano10040817
Received: 30 March 2020 / Revised: 17 April 2020 / Accepted: 21 April 2020 / Published: 24 April 2020
Epitaxial films of high critical temperature ( T c ) 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, T c 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 L 3 edge to study the crystal field and spin excitations of NdBa 2 Cu 3 O 7 x ultrathin films grown on SrTiO 3 , 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 and x-ray diffraction. View Full-Text
Keywords: unit cell-thick films; superconductivity; resonant inelastic x-ray scattering unit cell-thick films; superconductivity; resonant inelastic x-ray scattering
Show Figures

Figure 1

MDPI and ACS Style

Moretti Sala, M.; Salluzzo, M.; Minola, M.; De Luca, G.M.; Dellea, G.; Srot, V.; Wang, Y.; van Aken, P.A.; Le Tacon, M.; Keimer, B.; Dallera, C.; Braicovich, L.; Ghiringhelli, G. Structural, Electronic and Magnetic Properties of a Few Nanometer-Thick Superconducting NdBa2Cu3O7 Films. Nanomaterials 2020, 10, 817.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop