論文

査読有り
2015年4月

Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe2(As1-xPx)(2)

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
  • Tetsuya Iye
  • ,
  • Marc-Henri Julien
  • ,
  • Hadrien Mayaffre
  • ,
  • Mladen Horvatic
  • ,
  • Claude Berthier
  • ,
  • Kenji Ishida
  • ,
  • Hiroaki Ikeda
  • ,
  • Shigeru Kasahara
  • ,
  • Takasada Shibauchi
  • ,
  • Yuji Matsuda

84
4
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.7566/JPSJ.84.043705
出版者・発行元
PHYSICAL SOC JAPAN

We report on As-75-NMR measurements in single crystalline BaFe2(As0.96P0.04)(2) for magnetic fields parallel to the orthorhombic [110](o) and [100](o) directions above the structural transition temperature T-S similar or equal to 121 K. A large difference in the linewidth between the two field directions reveals in-plane anisotropy of the electric field gradient, even in the tetragonal phase. This provides microscopic evidence of population imbalance between As-4p(x) and 4p(y) orbitals, which reaches vertical bar n(x) - n(y)vertical bar/vertical bar n(x) + n(y)vertical bar similar to 15% at T -> T-S and is a natural consequence of the orbital ordering of Fe-3d(xz) and d(yz) electrons. Surprisingly, this orbital polarization is found to be already static near room temperature, suggesting that it arises from the pinning of anisotropic orbital fluctuations by disorder. The effect is found to be stronger below similar to 160 K, which coincides with the appearance of nematicity in previous torque and photoemission measurements. These results impose strong constraints on microscopic models of the nematic state.

Web of Science ® 被引用回数 : 40

リンク情報
DOI
https://doi.org/10.7566/JPSJ.84.043705
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000350743500006&DestApp=WOS_CPL
ID情報
  • DOI : 10.7566/JPSJ.84.043705
  • ISSN : 0031-9015
  • Web of Science ID : WOS:000350743500006

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