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Synthesis and electronic properties of Ndn+1NinO3n+1 Ruddlesden-Popper nickelate thin films
- Pan, Grace A;
- Song, Qi;
- Segedin, Dan Ferenc;
- Jung, Myung-Chul;
- El-Sherif, Hesham;
- Fleck, Erin E;
- Goodge, Berit H;
- Doyle, Spencer;
- Carrizales, Denisse Córdova;
- N'Diaye, Alpha T;
- Shafer, Padraic;
- Paik, Hanjong;
- Kourkoutis, Lena F;
- Baggari, Ismail El;
- Botana, Antia S;
- Brooks, Charles M;
- Mundy, Julia A
- et al.
Abstract
The rare-earth nickelates possess a diverse set of collective phenomena including metal-to-insulator transitions, magnetic phase transitions, and upon chemical reduction, superconductivity. Here, we demonstrate epitaxial stabilization of layered nickelates in the Ruddlesden-Popper form Ndn+1NinO3n+1 using molecular beam epitaxy. By optimizing the stoichiometry of the parent perovskite NdNiO3, we can reproducibly synthesize the n=1-5 member compounds. X-ray absorption spectroscopy at the O K and Ni L edges indicate systematic changes in both the nickel-oxygen hybridization level and nominal nickel filling from 3d8 to 3d7 as we move across the series from n=1 to ∞. The n=3-5 compounds exhibit weakly hysteretic metal-to-insulator transitions with transition temperatures that depress with increasing order toward NdNiO3 (n=∞).
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