The influence of the structural transition on magnetic fluctuations in NaFeAs

ORAL

Abstract

NaFeAs belongs to a class of Fe-based superconductors which have parent compounds that show separated structural and magnetic transitions. Effects of the structural transition on spin dynamics therefore can be investigated separately from the magnetic transition. A plateau in dynamic spin response is observed in a critical region around the structural transition temperature $T_{\mathrm{S}}$. It is interpreted as being due to the stiffening of spin fluctuations along the in-plane magnetic hard axis due to the d$_{\mathrm{xz}}$ and d$_{\mathrm{yz}}$ orbital ordering. The appearance of anisotropic spin dynamics in the critical region above the $T_{\mathrm{S}}$ at $T$* offers a dynamic magnetic scattering mechanism for anisotropic electronic properties in the commonly referred `nematic phase'. Ref: J. Phys. Condens. Mater. 28 (2016) 27LT01

*The work at Renmin Univ of China was supported by the National Basic Research Program of China (Grant Nos. 2012CB921700 and 2011CBA00112) and the National Natural Science Foundation of China (Grant Nos. 11034012 and 11190024).

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Authors

  • Wei Bao

    • Department of Physics, Renmin Univ of China, Beijing 100872, China
    • Renmin Univ of China

  • Jinchen Wang

    • Department of Physics, Renmin Univ of China, Beijing 100872, China

  • Juanjuan Liu

    • Department of Physics, Renmin Univ of China, Beijing 100872, China

  • Wei Luo

    • Department of Physics, Renmin Univ of China, Beijing 100872, China

  • Jieming Sheng

    • Department of Physics, Renmin Univ of China, Beijing 100872, China

  • Aifeng Wang

    • Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China

  • Xianhui Chen

    • Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China

  • Sergey Danilkin

    • The Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia