中国物理B ›› 2013, Vol. 22 ›› Issue (8): 87409-087409.doi: 10.1088/1674-1056/22/8/087409

所属专题: TOPICAL REVIEW — Iron-based high temperature superconductors

• TOPICAL REVIEW—Iron-based high temperature superconductors • 上一篇    下一篇

Microstructure and structural phase transitions in iron-based superconductors

王臻, 蔡瑶, 杨槐馨, 田焕芳, 王秩伟, 马超, 陈震, 李建奇   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2013-04-23 出版日期:2013-06-27 发布日期:2013-06-27
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00101, 2010CB923002, 2011CB921703, and 2012CB821404), the National Natural Science Foundation of China (Grant Nos. 11274368, 51272277, 11074292, 11004229, and 11190022), and the Chinese Academy of Sciences.

Microstructure and structural phase transitions in iron-based superconductors

Wang Zhen (王臻), Cai Yao (蔡瑶), Yang Huai-Xin (杨槐馨), Tian Huan-Fang (田焕芳), Wang Zhi-Wei (王秩伟), Ma Chao (马超), Chen Zhen (陈震), Li Jian-Qi (李建奇)   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-04-23 Online:2013-06-27 Published:2013-06-27
  • Contact: Li Jian-Qi E-mail:LJQ@aphy.iphy.ac.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00101, 2010CB923002, 2011CB921703, and 2012CB821404), the National Natural Science Foundation of China (Grant Nos. 11274368, 51272277, 11074292, 11004229, and 11190022), and the Chinese Academy of Sciences.

摘要: Crystal structures and microstructural features, such as structural phase transitions, defect structures, and chemical and structural inhomogeneities, are known to have profound effects on the physical properties of superconducting materials. Recently, many studies on the structural properties of Fe-based high-Tc superconductors have been published. This review article will mainly focus on the typical microstructural features in samples that have been well characterized by physical measurements. (i) Certain common structural features are discussed, in particular, the crystal structural features for different superconducting families, the local structural distortions in the Fe2Pn2 (Pn=P, As, Sb) or Fe2Ch2 (Ch=S, Se, Te) blocks, and the structural transformations in the 122 system. (ii) In FeTe(Se) (11 family), the superconductivity, chemical and structural inhomogeneities are investigated and discussed in correlation with superconductivity. (iii) In the K0.8Fe1,6+xSe2 system, we focus on the typical compounds with emphasis on the Fe-vacancy order and phase separations. The microstructural features in other superconducting materials are also briefly discussed.

关键词: Fe-based superconductor, structural transition, structural inhomogeneity, phase separation

Abstract: Crystal structures and microstructural features, such as structural phase transitions, defect structures, and chemical and structural inhomogeneities, are known to have profound effects on the physical properties of superconducting materials. Recently, many studies on the structural properties of Fe-based high-Tc superconductors have been published. This review article will mainly focus on the typical microstructural features in samples that have been well characterized by physical measurements. (i) Certain common structural features are discussed, in particular, the crystal structural features for different superconducting families, the local structural distortions in the Fe2Pn2 (Pn=P, As, Sb) or Fe2Ch2 (Ch=S, Se, Te) blocks, and the structural transformations in the 122 system. (ii) In FeTe(Se) (11 family), the superconductivity, chemical and structural inhomogeneities are investigated and discussed in correlation with superconductivity. (iii) In the K0.8Fe1,6+xSe2 system, we focus on the typical compounds with emphasis on the Fe-vacancy order and phase separations. The microstructural features in other superconducting materials are also briefly discussed.

Key words: Fe-based superconductor, structural transition, structural inhomogeneity, phase separation

中图分类号:  (Pnictides and chalcogenides)

  • 74.70.Xa
61.05.J- (Electron diffraction and scattering) 61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 61.72.-y (Defects and impurities in crystals; microstructure)