Tailoring the breathing-mode distortions in nickelate-ferroelectric heterostructures
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915186152046592 |
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| author | Krieger, Guillaume Su, Chia-Ping Sahib, Hoshang Fan, Raymond Steadman, Paul Gloter, Alexandre Viart, Nathalie Preziosi, Daniele |
| author_facet | Krieger, Guillaume Su, Chia-Ping Sahib, Hoshang Fan, Raymond Steadman, Paul Gloter, Alexandre Viart, Nathalie Preziosi, Daniele |
| contents | In transition metal oxides electron-electron interaction and lattice degree of freedom are basic ingredients of emergent phenomena, such as metal-to-insulator transition (MIT) and superconductivity. Perovskite rare-earth nickelates are largely studied for their temperature-driven MIT which is accompanied by a breathing mode distortion, and associated to a bond-disproportionation of the expanded (3d8L0) and compressed (3d8L2) NiO6 octahedra. Steric effects control the onset temperature of the MIT, the latter being concomitant or not with a complex antiferromagnetic spin arrangement depending upon the choice of the rare earth ion (TMIT>TNeel). Interface engineering of oxygen octahedra tilting, as imposed by the symmetry and orientation of the substrate, has resulted in an efficient pathway to modify both TMIT and TNeel, hence, suggesting a key role of the electron-phonon coupling for both transport and magnetic properties in nickelate thin films. Here, via a combination of resonant elastic X-ray scattering and transport experiments, we show a control over both TMIT and TNeel in heteroepitaxial PZT(d)/NNO(7 nm)//STO heterostructures, which are characterized by different strains and polarization states of the PZT layer grown at different thicknesses d. We found the expected NNO bulk behaviour, for a fully relaxed PZT layer showing a monodomain polarization state. On the other side, an almost 30 K difference, is found for a fully strained PZT characterized by a multidomain texture of the polarization state. We discuss our results in terms of an altered breathing distortion pattern of the underlying nickelate layer as supported by X-ray absorption spectroscopy measurements. We infer that locally different polar distortions controlled by a combination of polarization direction and strength of the strain state play the main role in the observed TMIT and TNeel variations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_05375 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tailoring the breathing-mode distortions in nickelate-ferroelectric heterostructures Krieger, Guillaume Su, Chia-Ping Sahib, Hoshang Fan, Raymond Steadman, Paul Gloter, Alexandre Viart, Nathalie Preziosi, Daniele Materials Science Strongly Correlated Electrons In transition metal oxides electron-electron interaction and lattice degree of freedom are basic ingredients of emergent phenomena, such as metal-to-insulator transition (MIT) and superconductivity. Perovskite rare-earth nickelates are largely studied for their temperature-driven MIT which is accompanied by a breathing mode distortion, and associated to a bond-disproportionation of the expanded (3d8L0) and compressed (3d8L2) NiO6 octahedra. Steric effects control the onset temperature of the MIT, the latter being concomitant or not with a complex antiferromagnetic spin arrangement depending upon the choice of the rare earth ion (TMIT>TNeel). Interface engineering of oxygen octahedra tilting, as imposed by the symmetry and orientation of the substrate, has resulted in an efficient pathway to modify both TMIT and TNeel, hence, suggesting a key role of the electron-phonon coupling for both transport and magnetic properties in nickelate thin films. Here, via a combination of resonant elastic X-ray scattering and transport experiments, we show a control over both TMIT and TNeel in heteroepitaxial PZT(d)/NNO(7 nm)//STO heterostructures, which are characterized by different strains and polarization states of the PZT layer grown at different thicknesses d. We found the expected NNO bulk behaviour, for a fully relaxed PZT layer showing a monodomain polarization state. On the other side, an almost 30 K difference, is found for a fully strained PZT characterized by a multidomain texture of the polarization state. We discuss our results in terms of an altered breathing distortion pattern of the underlying nickelate layer as supported by X-ray absorption spectroscopy measurements. We infer that locally different polar distortions controlled by a combination of polarization direction and strength of the strain state play the main role in the observed TMIT and TNeel variations. |
| title | Tailoring the breathing-mode distortions in nickelate-ferroelectric heterostructures |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.05375 |