1 Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China; 2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 4 Department of Physics, Shanghai Normal University, Shanghai 200234, China; 5 Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany 6 National Synchrotron Radiation Research Center (NSRRC), Hsinchu Science Park, Hsinchu 300092, Taiwan, China 7 Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China 8 Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract Perovskite oxynitrides (N,O), a crucial class in materials science, have attracted much attention. By precisely controlling - and -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, CeNbON, 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 state with 4d electronic configuration in CeNbON. As a result, the resistivity of CeNbON is sharply reduced compared to its counterpart CeTaON and other Nb compounds. No long-range spin order is found to occur with the temperature down to 2 K in CeNbON, while a remarkable negative magnetoresistance effect shows up at lower temperatures, probably due to the magnetic scattering arising from short-range spin correlations.
(Magnetotransport phenomena; materials for magnetotransport)
Fund: Project supported by the National Key R&D Program of China (Grant No. 2021YFA1400300), the National Natural Science Foundation of China (Grant Nos. 12425403, 12261131499, 12304268, 12304159, 11934017, and 11921004), and the China Postdoctoral Science Foundation (Grant No. 2023M743741). The synchrotron x-ray diffraction experiments were performed at SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Grant Nos. 2023B1575, 2023B1976, 2024A1506, and 2024A1695).
Corresponding Authors:
Zhenhua Chi, Yao Shen, Youwen Long
E-mail: zhchi@issp.ac.cn;yshen@iphy.ac.cn;ywlong@iphy.ac.cn
Cite this article:
Shengjie Liu(刘胜杰), Xubin Ye(叶旭斌), Zhao Pan(潘昭), Jie Zhang(张杰), Shuai Tang(唐帅), Guangkai Zhang(张广凯), Maocai Pi(皮茂材), Zhiwei Hu(胡志伟), Chien-Te Chen(陈建德), Ting-Shan Chan(詹丁山), Cheng Dong(董成), Tian Cui(崔田), Yanping Huang(黄艳萍), Zhenhua Chi(迟振华), Yao Shen(沈瑶), and Youwen Long(龙有文) High-pressure synthesis of an oxynitride perovskite CeNbO2N with Nb4+ charge state 2025 Chin. Phys. B 34 066202
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