中国物理B ›› 2006, Vol. 15 ›› Issue (12): 3005-3013.doi: 10.1088/1009-1963/15/12/039

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Structural classification and a binary structure model for superconductors

董 成   

  1. National Laboratory for Superconductivity, Institute of Physics & Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2006-06-14 修回日期:2006-08-03 出版日期:2006-12-20 发布日期:2006-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 20271052 and 20571083).

Structural classification and a binary structure model for superconductors

Dong Cheng(董成)†   

  1. National Laboratory for Superconductivity, Institute of Physics & Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2006-06-14 Revised:2006-08-03 Online:2006-12-20 Published:2006-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 20271052 and 20571083).

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摘要： Based on structural and bonding features, a new classification scheme of superconductors is proposed to classify them into three classes: three-dimensional, two-dimensional and molecule-assembled superconductors. The sandwich model' for the high-Tc cuprates is extended to a `binary structure model': i.e., the crystal structure of most superconductors can be partitioned into two parts, a superconducting active component and a supplementary component. Partially metallic covalent bonding is found to be a common feature in all superconducting active components, and the electron states of the atoms in the active components usually make a dominant contribution to the energy band near the Fermi surface. Possible directions to explore new superconductors are discussed based on the structural classification and the binary structure model.

关键词: superconductors, crystal structure, chemical bond, model

Abstract: Based on structural and bonding features, a new classification scheme of superconductors is proposed to classify them into three classes: three-dimensional, two-dimensional and molecule-assembled superconductors. The sandwich model' for the high-Tc cuprates is extended to a `binary structure model': i.e., the crystal structure of most superconductors can be partitioned into two parts, a superconducting active component and a supplementary component. Partially metallic covalent bonding is found to be a common feature in all superconducting active components, and the electron states of the atoms in the active components usually make a dominant contribution to the energy band near the Fermi surface. Possible directions to explore new superconductors are discussed based on the structural classification and the binary structure model.

Key words: superconductors, crystal structure, chemical bond, model

中图分类号:  (Theories and models of superconducting state)

  • 74.20.-z
61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling) 61.50.Lt (Crystal binding; cohesive energy) 74.70.-b (Superconducting materials other than cuprates)