中国物理B ›› 2016, Vol. 25 ›› Issue (2): 20701-020701.doi: 10.1088/1674-1056/25/2/020701

• SPECIAL TOPIC—Soft matter and biological physics (Review) • 上一篇    下一篇

A-site ordered perovskiteCaCu3Cu2Ir2O12-δ with square-planar and octahedral coordinated Cu ions

Qing Zhao(赵庆), Yun-Yu Yin(殷云宇), Jian-Hong Dai(戴建洪), Xi Shen(沈希), Zhi-Wei Hu(胡志伟), Jun-Ye Yang(杨俊叶), Qing-Tao Wang(王清涛), Ri-Cheng Yu(禹日成), Xiao-Dong Li(李晓东), You-Wen Long(龙有文)   

  1. 1. College of Physics, Qingdao University, Qingdao;
    2. 66071, China 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3. Max-Planck Institute for Chemical Physics of Solids, Ne 40, 01187 Dresden, Germany;
    4. Key Laboratory of Photonics Materials and Technology in Universities of Shandong (Qingdao University), Qingdao 266071, China;
    5. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    6. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
  • 收稿日期:2015-10-13 修回日期:2015-11-03 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: You-Wen Long E-mail:wangqt@qdu.edu.cn
  • 基金资助:

    Project supported by the National Basic Research Program of China (Grant No. 2014CB921500), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07030300), and the National Natural Science Foundation of China (Grant No. 11574378).

A-site ordered perovskiteCaCu3Cu2Ir2O12-δ with square-planar and octahedral coordinated Cu ions

Qing Zhao(赵庆)1,2, Yun-Yu Yin(殷云宇)2, Jian-Hong Dai(戴建洪)2, Xi Shen(沈希)2, Zhi-Wei Hu(胡志伟)3, Jun-Ye Yang(杨俊叶)2, Qing-Tao Wang(王清涛)1,4, Ri-Cheng Yu(禹日成)2, Xiao-Dong Li(李晓东)5, You-Wen Long(龙有文)2,6   

  1. 1. College of Physics, Qingdao University, Qingdao;
    2. 66071, China 2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3. Max-Planck Institute for Chemical Physics of Solids, Ne 40, 01187 Dresden, Germany;
    4. Key Laboratory of Photonics Materials and Technology in Universities of Shandong (Qingdao University), Qingdao 266071, China;
    5. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    6. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
  • Received:2015-10-13 Revised:2015-11-03 Online:2016-02-05 Published:2016-02-05
  • Contact: You-Wen Long E-mail:wangqt@qdu.edu.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant No. 2014CB921500), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07030300), and the National Natural Science Foundation of China (Grant No. 11574378).

摘要:

A novel CaCu3Cu2Ir2O12-δ polycrystalline sample was synthesized at 8 GPa and 1373 K. Rietveld structural analysis shows that this compound crystallizes in an AA'3B4O12-type A-site ordered perovskite structure with space group Im-3. X-ray absorption spectra reveal a +2-charge state for both the square-planar and octahedral coordinated Cu ions, and the valence state of Ir is found to be about +5. Although the A-site Ca and the A' -site Cu2+ are 1:3 ordered at fixed atomic positions, the distribution of B-site Cu2+ and Ir5+ is disorderly. As a result, no long-range magnetic ordering is observed at temperatures down to 2 K. Electrical transport and heat capacity measurements demonstrate itinerant electronic behavior. The crystal structure is stable with pressure up to 35.7 GPa at room temperature.

关键词: high pressure synthesis, A-site ordered perovskite, valence state, magnetic property

Abstract:

A novel CaCu3Cu2Ir2O12-δ polycrystalline sample was synthesized at 8 GPa and 1373 K. Rietveld structural analysis shows that this compound crystallizes in an AA'3B4O12-type A-site ordered perovskite structure with space group Im-3. X-ray absorption spectra reveal a +2-charge state for both the square-planar and octahedral coordinated Cu ions, and the valence state of Ir is found to be about +5. Although the A-site Ca and the A' -site Cu2+ are 1:3 ordered at fixed atomic positions, the distribution of B-site Cu2+ and Ir5+ is disorderly. As a result, no long-range magnetic ordering is observed at temperatures down to 2 K. Electrical transport and heat capacity measurements demonstrate itinerant electronic behavior. The crystal structure is stable with pressure up to 35.7 GPa at room temperature.

Key words: high pressure synthesis, A-site ordered perovskite, valence state, magnetic property

中图分类号:  (High-pressure apparatus; shock tubes; diamond anvil cells)

  • 07.35.+k
61.05.cj (X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.) 75.20.-g (Diamagnetism, paramagnetism, and superparamagnetism)