Microstructure and structural phase transitions in iron-based superconductors

doi:10.1088/1674-1056/22/8/087409

摘要/Abstract

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-T_c 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 K_0.8Fe_1,6+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-T_c 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 K_0.8Fe_1,6+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)

王臻, 蔡瑶, 杨槐馨, 田焕芳, 王秩伟, 马超, 陈震, 李建奇. Microstructure and structural phase transitions in iron-based superconductors[J]. 中国物理B, 2013, 22(8): 87409-087409.

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). Microstructure and structural phase transitions in iron-based superconductors[J]. Chin. Phys. B, 2013, 22(8): 87409-087409.

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