Oxygen-Driven Metal–Insulator Transition in SrNbO3 Thin Films Probed by Infrared Spectroscopy

Paola Di Pietro; Chiara Bigi; Sandeep Kumar Chaluvadi; Daniel Knez; Piu Rajak; Regina Ciancio; Jun Fujii; Francesco Mercuri; Stefano Lupi; Giorgio Rossi; Francesco Borgatti; Andrea Perucchi; Pasquale Orgiani

doi:10.1002/aelm.202101338

Oxygen-Driven Metal–Insulator Transition in SrNbO₃ Thin Films Probed by Infrared Spectroscopy

Paola Di Pietro, Chiara Bigi, Sandeep Kumar Chaluvadi, Daniel Knez, Piu Rajak, Regina Ciancio, Jun Fujii, Francesco Mercuri, Stefano Lupi, Giorgio Rossi, Francesco Borgatti, Andrea Perucchi, Pasquale Orgiani^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The occurrence of oxygen-driven metal–insulator-transition (MIT) in SrNbO₃ (SNO) thin films epitaxially grown on (110)-oriented DyScO₃ has been reported. SNO films are fabricated by the pulsed laser deposition technique at different partial O₂ pressure to vary the oxygen content and their structural, optical, and transport properties are probed. SNO unit cell has been found to shrink vertically as the oxygen content increases but keeping the epitaxial matching with the substrate. The results of Fourier-transform infra-red spectroscopy show that highly oxygenated SNO samples (i.e., grown at high oxygen pressure) show distinct optical conductivity behavior with respect to oxygen deficient films, hence demonstrating the insulating character of the formers with respect to those fabricated with lower pressure conditions. Tailoring the optical absorption and conductivity of strontium niobate epitaxial films across the MIT will favor novel applications of this material.

Original language	English
Article number	2101338
Journal	Advanced Electronic Materials
Volume	8
Issue number	7
DOIs	https://doi.org/10.1002/aelm.202101338
Publication status	Published - Jul 2022
Externally published	Yes

Keywords

high-resolution transmission electron microscopy
infrared spectroscopy
perovskite oxides
thin-films
X-ray powder diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials

Access to Document

10.1002/aelm.202101338Licence: CC BY 4.0

Cite this

@article{4d85add6b4e742478a0cd71cfbb54315,

title = "Oxygen-Driven Metal–Insulator Transition in SrNbO3 Thin Films Probed by Infrared Spectroscopy",

abstract = "The occurrence of oxygen-driven metal–insulator-transition (MIT) in SrNbO3 (SNO) thin films epitaxially grown on (110)-oriented DyScO3 has been reported. SNO films are fabricated by the pulsed laser deposition technique at different partial O2 pressure to vary the oxygen content and their structural, optical, and transport properties are probed. SNO unit cell has been found to shrink vertically as the oxygen content increases but keeping the epitaxial matching with the substrate. The results of Fourier-transform infra-red spectroscopy show that highly oxygenated SNO samples (i.e., grown at high oxygen pressure) show distinct optical conductivity behavior with respect to oxygen deficient films, hence demonstrating the insulating character of the formers with respect to those fabricated with lower pressure conditions. Tailoring the optical absorption and conductivity of strontium niobate epitaxial films across the MIT will favor novel applications of this material.",

keywords = "high-resolution transmission electron microscopy, infrared spectroscopy, perovskite oxides, thin-films, X-ray powder diffraction",

author = "{Di Pietro}, Paola and Chiara Bigi and Chaluvadi, {Sandeep Kumar} and Daniel Knez and Piu Rajak and Regina Ciancio and Jun Fujii and Francesco Mercuri and Stefano Lupi and Giorgio Rossi and Francesco Borgatti and Andrea Perucchi and Pasquale Orgiani",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors. Advanced Electronic Materials published by Wiley-VCH GmbH",

year = "2022",

month = jul,

doi = "10.1002/aelm.202101338",

language = "English",

volume = "8",

journal = "Advanced Electronic Materials",

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T1 - Oxygen-Driven Metal–Insulator Transition in SrNbO3 Thin Films Probed by Infrared Spectroscopy

AU - Di Pietro, Paola

AU - Bigi, Chiara

AU - Chaluvadi, Sandeep Kumar

AU - Knez, Daniel

AU - Rajak, Piu

AU - Ciancio, Regina

AU - Fujii, Jun

AU - Mercuri, Francesco

AU - Lupi, Stefano

AU - Rossi, Giorgio

AU - Borgatti, Francesco

AU - Perucchi, Andrea

AU - Orgiani, Pasquale

PY - 2022/7

Y1 - 2022/7

N2 - The occurrence of oxygen-driven metal–insulator-transition (MIT) in SrNbO3 (SNO) thin films epitaxially grown on (110)-oriented DyScO3 has been reported. SNO films are fabricated by the pulsed laser deposition technique at different partial O2 pressure to vary the oxygen content and their structural, optical, and transport properties are probed. SNO unit cell has been found to shrink vertically as the oxygen content increases but keeping the epitaxial matching with the substrate. The results of Fourier-transform infra-red spectroscopy show that highly oxygenated SNO samples (i.e., grown at high oxygen pressure) show distinct optical conductivity behavior with respect to oxygen deficient films, hence demonstrating the insulating character of the formers with respect to those fabricated with lower pressure conditions. Tailoring the optical absorption and conductivity of strontium niobate epitaxial films across the MIT will favor novel applications of this material.

AB - The occurrence of oxygen-driven metal–insulator-transition (MIT) in SrNbO3 (SNO) thin films epitaxially grown on (110)-oriented DyScO3 has been reported. SNO films are fabricated by the pulsed laser deposition technique at different partial O2 pressure to vary the oxygen content and their structural, optical, and transport properties are probed. SNO unit cell has been found to shrink vertically as the oxygen content increases but keeping the epitaxial matching with the substrate. The results of Fourier-transform infra-red spectroscopy show that highly oxygenated SNO samples (i.e., grown at high oxygen pressure) show distinct optical conductivity behavior with respect to oxygen deficient films, hence demonstrating the insulating character of the formers with respect to those fabricated with lower pressure conditions. Tailoring the optical absorption and conductivity of strontium niobate epitaxial films across the MIT will favor novel applications of this material.

KW - high-resolution transmission electron microscopy

KW - infrared spectroscopy

KW - perovskite oxides

KW - thin-films

KW - X-ray powder diffraction

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