High-pressure synthesis of an oxynitride perovskite CeNbO<sub>2</sub>N with Nb<sup>4+</sup> charge state
Abstract Perovskite oxynitrides AB (N,O) 3 , a crucial class in materials science, have attracted much attention. By precisely controlling A - and B -site ions and tuning the N/O ratio, new materials with exotic charge states and intriguing electronic behaviors can be designed and synthesized. In this work, a novel oxynitride perovskite, CeNbO 2 N, was prepared under high-temperature and high-pressure conditions. The compound crystallizes in an orthorhombic perovskite structure in Pnma symmetry with disordered N/O distribution. The x-ray absorption spectroscopy confirms the presence of a Nb 4+ state with 4d 1 electronic configuration in CeNbO 2 N. As a result, the resistivity of CeNbO 2 N is sharply reduced compared to its counterpart CeTa 5+ ON 2 and other Nb 5+ compounds. No long-range spin order is found to occur with the temperature down to 2 K in CeNbO 2 N, while a remarkable negative magnetoresistance effect shows up at lower temperatures, probably due to the magnetic scattering arising from short-range spin correlations.
Authors
- Zhiwei Hu (ORCID: https://orcid.org/0000-0003-0324-2227)
- Youwen Long (ORCID: https://orcid.org/0000-0002-8587-7818)
- Xubin Ye (ORCID: https://orcid.org/0000-0002-5739-8318)
- Tianhong Cui (ORCID: https://orcid.org/0000-0002-7427-2274)
- Chien‐Te Chen (ORCID: https://orcid.org/0000-0002-1881-2600)
- Maocai Pi
- Shengjie Liu (ORCID: https://orcid.org/0000-0003-0253-7410)
- Ting‐Shan Chan (ORCID: https://orcid.org/0000-0001-5220-1611)
- Jie Zhang (ORCID: https://orcid.org/0000-0002-6944-2021)
- Cheng Dong (ORCID: https://orcid.org/0000-0003-2093-7573)
- Pan Zhao (ORCID: https://orcid.org/0009-0005-7118-5430)
- Guangkai Zhang (ORCID: https://orcid.org/0000-0001-5631-0540)
- Yao Shen
- Zhenhua Chi (ORCID: https://orcid.org/0000-0001-9813-7299)
- Yanping Huang
- Shuai Tang (ORCID: https://orcid.org/0000-0003-2822-5060)
Institutions
- Ningbo University (CN)
- Chinese Academy of Sciences (CN)
- Shanghai Normal University (CN)
- National Synchrotron Radiation Research Center (TW)
- Max Planck Institute for Chemical Physics of Solids (DE)
- Songshan Lake Materials Laboratory (CN)
- Institute of Plasma Physics (CN)
- Institute of Physics (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Chinese Physics B
- Published
- 2025-03-28
- DOI
- https://doi.org/10.1088/1674-1056/adc668
- Primary Topic
- Inorganic Chemistry and Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00