中国物理B ›› 2011, Vol. 20 ›› Issue (3): 37104-037104.doi: 10.1088/1674-1056/20/3/037104

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Renormalization of spin polarised itinerant electron bands in the normal state of a model ferromagnetic superconductor

黄爱群1, 李俊1, 马磊2   

  1. (1)National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; (2)National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;Department of Physics and Electronic Engineering, Zaozhuang University, Zaozhuang 277160, China
  • 收稿日期:2010-08-24 修回日期:2010-10-22 出版日期:2011-03-15 发布日期:2011-03-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10574063).

Renormalization of spin polarised itinerant electron bands in the normal state of a model ferromagnetic superconductor

Ma Lei(马磊)a)b)†, Huang Ai-Qun(黄爱群)a), and Li Jun(李俊) a)   

  1. a National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; b Department of Physics and Electronic Engineering, Zaozhuang University, Zaozhuang 277160, China
  • Received:2010-08-24 Revised:2010-10-22 Online:2011-03-15 Published:2011-03-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10574063).

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摘要： This paper studies the normal state properties of itinerant electrons in a toy model, which is constructed according to the model for coexisting ferromagnetism and superconductivity proposed by Suhl [Suhl H 2001 Phys. Rev. Lett. 87 167007]. In this theory with ferromagnetic ordering based on localized spins, the exchange interaction J between conduction electrons and localized spin is taken as the pairing glue for s-wave superconductivity. It shows that this J term will first renormalize the normal state single conduction electron structures substantially. It finds dramatically enhanced or suppressed magnetization of itinerant electrons for positive or negative J. Singlet Cooper pairing can be ruled out due to strong spin polarisation in the J > 0 case while a narrow window for s-wave superconductivity is opened around some ferromagnetic J.

关键词: magnetically ordered materials, exchange and superexchange, superconductor

Abstract: This paper studies the normal state properties of itinerant electrons in a toy model, which is constructed according to the model for coexisting ferromagnetism and superconductivity proposed by Suhl [Suhl H 2001 Phys. Rev. Lett. 87 167007]. In this theory with ferromagnetic ordering based on localized spins, the exchange interaction J between conduction electrons and localized spin is taken as the pairing glue for s-wave superconductivity. It shows that this J term will first renormalize the normal state single conduction electron structures substantially. It finds dramatically enhanced or suppressed magnetization of itinerant electrons for positive or negative J. Singlet Cooper pairing can be ruled out due to strong spin polarisation in the J > 0 case while a narrow window for s-wave superconductivity is opened around some ferromagnetic J.

Key words: magnetically ordered materials, exchange and superexchange, superconductor

中图分类号:  (Level splitting and interactions)

  • 71.70.-d
74.20.Mn (Nonconventional mechanisms) 74.25.Jb (Electronic structure (photoemission, etc.)) 75.30.Et (Exchange and superexchange interactions)