Superconductivity in PrNiO2 infinite-layer nickelates
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866909533273587712 |
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| author | Sahib, Hoshang Rosa, Francesco Raji, Aravind Merzoni, Giacomo Ghiringhelli, Giacomo Salluzzo, Marco Gloter, Alexandre Viart, Nathalie Preziosi, Daniele |
| author_facet | Sahib, Hoshang Rosa, Francesco Raji, Aravind Merzoni, Giacomo Ghiringhelli, Giacomo Salluzzo, Marco Gloter, Alexandre Viart, Nathalie Preziosi, Daniele |
| contents | Several reports about infinite-layer nickelate thin films suggest that the superconducting critical temperature versus chemical doping phase diagram has a dome-like shape, similar to cuprates. Here, we demonstrate a highly reproducible superconducting state in undoped PrNiO$_2$ thin films grown onto SrTiO$_3$. Scanning transmission electron microscopy measurements demonstrate coherent and defect-free infinite-layer phase, a high structural quality with no unintentional chemical doping and a total absence of interstitial oxygen. X-ray absorption measurements show very sharp features at the Ni L$_{3,2}$-edges with a large linear dichroism, indicating the preferential hole-occupation of Ni$^{1+}$-3d$_{x^2-y^2}$ orbitals in a square planar geometry. Resonant inelastic X-ray scattering measurements reveal sharp magnon excitations of 200\,meV energy at magnetic Brillouin zone boundary, highly resonant at the Ni$^{1+}$ absorption peak. The results indicate that, when properly stabilized, infinite-layer nickelate thin films are superconducting without chemical doping. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_16147 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Superconductivity in PrNiO2 infinite-layer nickelates Sahib, Hoshang Rosa, Francesco Raji, Aravind Merzoni, Giacomo Ghiringhelli, Giacomo Salluzzo, Marco Gloter, Alexandre Viart, Nathalie Preziosi, Daniele Superconductivity Materials Science Several reports about infinite-layer nickelate thin films suggest that the superconducting critical temperature versus chemical doping phase diagram has a dome-like shape, similar to cuprates. Here, we demonstrate a highly reproducible superconducting state in undoped PrNiO$_2$ thin films grown onto SrTiO$_3$. Scanning transmission electron microscopy measurements demonstrate coherent and defect-free infinite-layer phase, a high structural quality with no unintentional chemical doping and a total absence of interstitial oxygen. X-ray absorption measurements show very sharp features at the Ni L$_{3,2}$-edges with a large linear dichroism, indicating the preferential hole-occupation of Ni$^{1+}$-3d$_{x^2-y^2}$ orbitals in a square planar geometry. Resonant inelastic X-ray scattering measurements reveal sharp magnon excitations of 200\,meV energy at magnetic Brillouin zone boundary, highly resonant at the Ni$^{1+}$ absorption peak. The results indicate that, when properly stabilized, infinite-layer nickelate thin films are superconducting without chemical doping. |
| title | Superconductivity in PrNiO2 infinite-layer nickelates |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2410.16147 |