中国物理B ›› 2019, Vol. 28 ›› Issue (5): 56103-056103.doi: 10.1088/1674-1056/28/5/056103

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Low temperature Pmmm and C2/m phases in Sr2CuO3+δ high temperature superconductor

Hai-Bo Wang(王海波), Zhen-Lin Luo(罗震林), Yuan-Jun Yang(杨远俊), Qing-Qing Liu(刘清青), Si-Xia Hu(胡思侠), Meng-Meng Yang(杨蒙蒙), Chang-Qing Jin(靳常青), Chen Gao(高琛)   

  1. 1 Tonghua Normal University, Tonghua 134002, China;
    2 National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China;
    3 Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;
    4 CAS Key Laboratory of Materials for Energy Conversion and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2018-11-30 修回日期:2019-03-12 出版日期:2019-05-05 发布日期:2019-05-05
  • 通讯作者: Zhen-Lin Luo, Chen Gao E-mail:cgao@ustc.edu.cn;zlluo@ustc.edu.cn
  • 基金资助:

    Project supported by the National Basic Research Program of China (Grant Nos. 2012CB922004/3, 2010CB934501, and 2009CB929502), the Funds of Jilin Province, China (Grant No. JJKH20180860KJ), the National Natural Science Foundation of China, and the Fundamental Research Funds for the Central Universities, China (Grant No. WK2310000043). The authors appreciate the beam time at BL14W1 and BL14B1 of Shanghai Synchrotron Radiation Facility.

Low temperature Pmmm and C2/m phases in Sr2CuO3+δ high temperature superconductor

Hai-Bo Wang(王海波)1, Zhen-Lin Luo(罗震林)2, Yuan-Jun Yang(杨远俊)2, Qing-Qing Liu(刘清青)3, Si-Xia Hu(胡思侠)2, Meng-Meng Yang(杨蒙蒙)2, Chang-Qing Jin(靳常青)3, Chen Gao(高琛)2,4   

  1. 1 Tonghua Normal University, Tonghua 134002, China;
    2 National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China;
    3 Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;
    4 CAS Key Laboratory of Materials for Energy Conversion and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei 230026, China
  • Received:2018-11-30 Revised:2019-03-12 Online:2019-05-05 Published:2019-05-05
  • Contact: Zhen-Lin Luo, Chen Gao E-mail:cgao@ustc.edu.cn;zlluo@ustc.edu.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant Nos. 2012CB922004/3, 2010CB934501, and 2009CB929502), the Funds of Jilin Province, China (Grant No. JJKH20180860KJ), the National Natural Science Foundation of China, and the Fundamental Research Funds for the Central Universities, China (Grant No. WK2310000043). The authors appreciate the beam time at BL14W1 and BL14B1 of Shanghai Synchrotron Radiation Facility.

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摘要：

A new low temperature Pmmm (120 K) phase was found in high temperature superconductor Sr2CuO3+δ, which was indicated as a pure electronic phase by resonant x-ray diffraction at Cu K-edge. As shown by x-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES) at Cu K-edge, the strong charge density redistribution and local lattice fluctuations around Cu site at the onset of phase transition were due to the occurrence of superconductive coherence, the redistribution and fluctuation finished at Tc. Finally, the electron-lattice interaction was mainly elaborated to understand the superconductivity of Sr2CuO3+δ.

关键词: resonant x-ray diffraction, x-ray absorption fine structure, modulated phase, superconductivity

Abstract:

A new low temperature Pmmm (120 K) phase was found in high temperature superconductor Sr2CuO3+δ, which was indicated as a pure electronic phase by resonant x-ray diffraction at Cu K-edge. As shown by x-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES) at Cu K-edge, the strong charge density redistribution and local lattice fluctuations around Cu site at the onset of phase transition were due to the occurrence of superconductive coherence, the redistribution and fluctuation finished at Tc. Finally, the electron-lattice interaction was mainly elaborated to understand the superconductivity of Sr2CuO3+δ.

Key words: resonant x-ray diffraction, x-ray absorption fine structure, modulated phase, superconductivity

中图分类号:  (X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.)

  • 61.05.cj
74.25.Jb (Electronic structure (photoemission, etc.)) 05.70.Fh (Phase transitions: general studies) 87.64.kd (X-ray and EXAFS)