中国物理B ›› 2025, Vol. 34 ›› Issue (6): 66202-066202.doi: 10.1088/1674-1056/adc668
所属专题： SPECIAL TOPIC — Structures and properties of materials under high pressure
High-pressure synthesis of an oxynitride perovskite CeNbO2N with Nb4+ charge state
Shengjie Liu(刘胜杰)1,2, Xubin Ye(叶旭斌)2, Zhao Pan(潘昭)2,3, Jie Zhang(张杰)2,3, Shuai Tang(唐帅)2,3, Guangkai Zhang(张广凯)2,4, Maocai Pi(皮茂材)2,3, Zhiwei Hu(胡志伟)5, Chien-Te Chen(陈建德)6, Ting-Shan Chan(詹丁山)6, Cheng Dong(董成)2, Tian Cui(崔田)1, Yanping Huang(黄艳萍)1, Zhenhua Chi(迟振华)7,†, Yao Shen(沈瑶)2,3,‡, and Youwen Long(龙有文)2,3,8,§
- 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
High-pressure synthesis of an oxynitride perovskite CeNbO2N with Nb4+ charge state
Shengjie Liu(刘胜杰)1,2, Xubin Ye(叶旭斌)2, Zhao Pan(潘昭)2,3, Jie Zhang(张杰)2,3, Shuai Tang(唐帅)2,3, Guangkai Zhang(张广凯)2,4, Maocai Pi(皮茂材)2,3, Zhiwei Hu(胡志伟)5, Chien-Te Chen(陈建德)6, Ting-Shan Chan(詹丁山)6, Cheng Dong(董成)2, Tian Cui(崔田)1, Yanping Huang(黄艳萍)1, Zhenhua Chi(迟振华)7,†, Yao Shen(沈瑶)2,3,‡, and Youwen Long(龙有文)2,3,8,§
- 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
摘要： 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.
中图分类号: (High-pressure effects in solids and liquids)
- 62.50.-p