中国物理B ›› 2016, Vol. 25 ›› Issue (2): 27401-027401.doi: 10.1088/1674-1056/25/2/027401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field

Lei-Lei Yang(杨雷雷), Da-Yong Liu(刘大勇), Dong-Meng Chen(陈东猛), Liang-Jian Zou(邹良剑)   

  1. 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
    2. College of Science, China University of Petroleum, Qingdao 266580, China;
    3. Department of Physics, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2015-10-15 修回日期:2015-11-10 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Da-Yong Liu E-mail:dyliu@theory.issp.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104274, 11274310, and 11474287) and the Fundamental Research Funds for the Central University (Grant No. 27R1310020A).

Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field

Lei-Lei Yang(杨雷雷)1, Da-Yong Liu(刘大勇)1, Dong-Meng Chen(陈东猛)2, Liang-Jian Zou(邹良剑)1,3   

  1. 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
    2. College of Science, China University of Petroleum, Qingdao 266580, China;
    3. Department of Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2015-10-15 Revised:2015-11-10 Online:2016-02-05 Published:2016-02-05
  • Contact: Da-Yong Liu E-mail:dyliu@theory.issp.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11104274, 11274310, and 11474287) and the Fundamental Research Funds for the Central University (Grant No. 27R1310020A).

摘要:

The magnetic properties of iron pnictide superconductors with magnetic rare-earth ions under strong magnetic field are investigated based on the cluster self-consistent field method. Starting from an effective Heisenberg model, we present the evolution of magnetic structures on magnetic field in RFeAsO (R = Ce, Pr, Nd, Sm, Gd, and Tb) and RFe2As2 (R = Eu) compounds. It is found that spin-flop transition occurs in both rare-earth and iron layers under magnetic field, in good agreement with the experimental results. The interplay between rare-earth and iron spins plays a key role in the magnetic-field-driven magnetic phase transition, which suggests that the rare-earth layers can modulate the magnetic behaviors of iron layers. In addition, the factors that affect the critical magnetic field for spin-flop transition are also discussed.

关键词: iron pnictide superconductors, rare-earth, magnetic field, spin-flop transition

Abstract:

The magnetic properties of iron pnictide superconductors with magnetic rare-earth ions under strong magnetic field are investigated based on the cluster self-consistent field method. Starting from an effective Heisenberg model, we present the evolution of magnetic structures on magnetic field in RFeAsO (R = Ce, Pr, Nd, Sm, Gd, and Tb) and RFe2As2 (R = Eu) compounds. It is found that spin-flop transition occurs in both rare-earth and iron layers under magnetic field, in good agreement with the experimental results. The interplay between rare-earth and iron spins plays a key role in the magnetic-field-driven magnetic phase transition, which suggests that the rare-earth layers can modulate the magnetic behaviors of iron layers. In addition, the factors that affect the critical magnetic field for spin-flop transition are also discussed.

Key words: iron pnictide superconductors, rare-earth, magnetic field, spin-flop transition

中图分类号:  (Pnictides and chalcogenides)

  • 74.70.Xa
74.25.Ha (Magnetic properties including vortex structures and related phenomena) 61.30.Gd (Orientational order of liquid crystals; electric and magnetic field effects on order)