論文

2017年4月

Systemic Study of Orbital and Spin Nematicity in NaFe1-xCoxAs by NMR

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
  • Rui Zhou
  • ,
  • Guo-qing Zheng

30
4
開始ページ
857
終了ページ
863
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1007/s10948-017-3997-5
出版者・発行元
SPRINGER

Nematic order, a self-organized state with rotational symmetry broken, has been observed in both copperoxide and iron-pnictide high temperature superconductors. However, its origin is still a mystery in the iron pnictides although it is considered as a key to understand the mechanism of superconductivity. Here, we report a systemic nuclear magnetic resonance (NMR) study on NaFe(1-x)C(o)xAs (0 <= x <= 0.042) that an orbital order, accompanied by an instant spin nematicity, occurs at at a temperature T* far above structural transition temperature Ts in the tetragonal phase. We show that the observed NMR spectra splitting and its evolution is due to an incommensurate orbital order that sets in below T* and becomes commensurate below T-s. We show that the electric field gradient asymmetry parameter is a good measure for the orbital order parameter which undergoes a Landau-like 2nd-order phase transition. We further show that the spin nematicity is well accounted for by the observed orbital order.


リンク情報
DOI
https://doi.org/10.1007/s10948-017-3997-5
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000396828100003&DestApp=WOS_CPL