Solid state reduction of nickelate thin films
The square-planar nickelates are a class of superconductors analogous to the cuprates and promise to provide insight into the pairing mechanism in high-temperature superconducting oxides. The parent phase of doped superconducting films is NdNiO2, which is prepared by reducing 3+ Ni in NdNiO3 films....
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| Veröffentlicht in: | Physical review materials 2023-01, Vol.7 (1), Article 013802 |
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| creator | Wei, Wenzheng Shin, Kidae Hong, Hawoong Shin, Yeongjae Thind, Arashdeep Singh Yang, Yingjie Klie, Robert F. Walker, Frederick J. Ahn, Charles H. |
| description | The square-planar nickelates are a class of superconductors analogous to the cuprates and promise to provide insight into the pairing mechanism in high-temperature superconducting oxides. The parent phase of doped superconducting films is NdNiO2, which is prepared by reducing 3+ Ni in NdNiO3 films. In this paper, we develop an ultrahigh vacuum reduction method using aluminum deposited on top of the 3+ nickelates and monitor the reduction process in real time through in situ crystal truncation rod measurements and diffraction x-ray absorption near edge spectroscopy measurements across the Ni K edge. Further, we establish a relation between Ni valence and the lattice constant of NdNiO3-x and show that the process can precisely control the oxygen content in the films. Finally, we extend the reduction process to quintuple square-planar nickelates. |
| doi_str_mv | 10.1103/PhysRevMaterials.7.013802 |
| format | Article |
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| subjects | crystal structure electronic structure MATERIALS SCIENCE molecular beam epitaxy perovskites synthesis ultrathin films X-ray absorption near-edge spectroscopy X-ray diffraction |
| title | Solid state reduction of nickelate thin films |
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