Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field |
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| Affiliation: | 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 |
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| 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 RFe_2As_2(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 magneticfield-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. |
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| Keywords: | iron pnictide superconductors rare-earth magnetic field spin-flop transition |
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