Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices DOI Creative Commons
R. A. Ortiz, Niklas Enderlein, K. Fürsich

и другие.

Physical Review Materials, Год журнала: 2025, Номер 9(5)

Опубликована: Май 27, 2025

The family of infinite-layer nickelates promises important insights into the mechanism unconventional superconductivity. Since superconductivity has so far only been observed in epitaxial thin films, heteroepitaxy with substrate or a capping layer possibly plays an role. Here, we use soft x-ray spectroscopy to investigate superlattices as potential approach for targeted material design high-temperature superconductors. We observe modulations valence state and oxygen coordination topotactically reduced artificial repeating interfaces between nickelate layers materials commonly used substrates layers. Our results show that depending on interlayer metallic conductivity akin parent compounds is achieved. Depth-resolved electronic structure measured by resonant reflectivity reveals reconstructed ligand field at interface, which confined one two unit cells. central are predominantly monovalent nickel, but linear dichroism analysis considerable disorder removal sites. quantitative correlation this future modeling strategies. Published American Physical Society 2025

Язык: Английский

Superconductivity in the Parent Infinite-Layer Nickelate NdNiO2 DOI Creative Commons
C. T. Parzyck, Yi Wu, Lopa Bhatt

и другие.

Physical Review X, Год журнала: 2025, Номер 15(2)

Опубликована: Май 12, 2025

We report evidence for superconductivity with onset temperatures up to 11 K in thin films of the infinite-layer nickelate parent compound NdNiO2. A combination oxide molecular beam epitaxy and atomic hydrogen reduction yields samples high crystallinity low residual resistivities, a substantial fraction which exhibit superconducting transitions. survey large series variety techniques, including electrical transport, scanning transmission electron microscopy, x-ray absorption spectroscopy, resonant inelastic scattering, investigate possible origins superconductivity. propose that could be intrinsic undoped nickelates but suppressed by disorder due possibly sign-changing order parameter, finding would necessitate reconsideration phase diagram. Another hypothesis is materials can hole doped from randomly dispersed apical oxygen atoms, suggest an alternative pathway achieving Published American Physical Society 2025

Язык: Английский

Процитировано

1
Oxygen sublattice disorder and valence state modulation in infinite-layer nickelate superlattices DOI Creative Commons
R. A. Ortiz, Niklas Enderlein, K. Fürsich

и другие.

Physical Review Materials, Год журнала: 2025, Номер 9(5)

Опубликована: Май 27, 2025

The family of infinite-layer nickelates promises important insights into the mechanism unconventional superconductivity. Since superconductivity has so far only been observed in epitaxial thin films, heteroepitaxy with substrate or a capping layer possibly plays an role. Here, we use soft x-ray spectroscopy to investigate superlattices as potential approach for targeted material design high-temperature superconductors. We observe modulations valence state and oxygen coordination topotactically reduced artificial repeating interfaces between nickelate layers materials commonly used substrates layers. Our results show that depending on interlayer metallic conductivity akin parent compounds is achieved. Depth-resolved electronic structure measured by resonant reflectivity reveals reconstructed ligand field at interface, which confined one two unit cells. central are predominantly monovalent nickel, but linear dichroism analysis considerable disorder removal sites. quantitative correlation this future modeling strategies. Published American Physical Society 2025

Язык: Английский

Процитировано

0