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Structural and electronic properties of SrCuO2+ δ thin films

De Luca, Gabriele
Herrero-Martín, Javier
Gibert, Marta
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Published in APL materials. 2022, vol. 10, no. 10, 101112

The layered structure of superconducting cuprates is considered to be a key ingredient to achieve high superconducting transition temperatures. In this work, we investigate the possibility of doping the SrCuO 2 infinite-layer compound by inserting additional oxygen into its structure. We observe that the infinite-layer SrCuO 2 structure is epitaxially stabilized in thin films grown by pulsed laser deposition in pure O 2 . Increasing the oxidizing power by introducing ozone during the growth leads to a different phase with an elongated c axis. Scanning transmission electron microscopy analysis suggests that the films with an elongated c axis are composed of SrCuO 2.5 blocks separated by SrCuO 2 layers arranged to match the substrate spacing. X-ray absorption spectroscopy measurements show that this SrCuO 2+ δ phase is associated with a more isotropic Cu orbital configuration and hole doping. This hole doping leads to a dramatic reduction in the resistivity of the films, with a magnitude that depends on the precise oxygen content in the structure.

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Research group Groupe Triscone
European Commission: Q-MAC
Swiss National Science Foundation: 200020_179155
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HADJIMICHAEL, Marios et al. Structural and electronic properties of SrCuO2+ δ thin films. In: APL materials, 2022, vol. 10, n° 10, p. 101112. doi: 10.1063/5.0107320 https://archive-ouverte.unige.ch/unige:164517

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Deposited on : 2022-11-01

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