論文

査読有り
2012年4月

Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O1-xFx) probed by As-75 and La-139 NMR

PHYSICAL REVIEW B
  • Yusuke Nakai
  • ,
  • Shunsaku Kitagawa
  • ,
  • Tetsuya Iye
  • ,
  • Kenji Ishida
  • ,
  • Yoichi Kamihara
  • ,
  • Masahiro Hirano
  • ,
  • Hideo Hosono

85
13
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.85.134408
出版者・発行元
AMER PHYSICAL SOC

As-75 and La-139 NMR results for LaFeAs(O1-xFx) (x = 0, 0.025, and 0.04) are reported. Upon F doping, the tetragonal-to-orthorhombic structural phase transition temperature T-S, antiferromagnetic transition temperature T-N, and internal magnetic field mu H-0(int) are gradually reduced for x < 0.04. However, at x = 0.04, T-N is abruptly suppressed to be 30 K along with a tiny mu H-0(int), which is distinct from the continuous disappearance of the ordered phases in the Ba122 systems of Ba(Fe,Co)(2)As-2 and BaFe2(As,P)(2). The anisotropy of the spin-lattice relaxation rate T-1(-1) , (T-1)H-parallel to ab(-1)/(T-1)H parallel to c(-1), in the paramagnetic phase of x = 0 and 0.025 is constant (similar to 1.5) but increases abruptly below T-S due to the enhancement of (T-1)H-parallel to ab(-1) by the slowing-down of magnetic fluctuations. This indicates that the tetragonal-to-orthorhombic structural distortion enhances the anisotropy in the spin space via magnetoelastic coupling and/or spin-orbit interaction.

Web of Science ® 被引用回数 : 17

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.85.134408
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000302400800003&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevB.85.134408
  • ISSN : 1098-0121
  • Web of Science ID : WOS:000302400800003

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