Journal article
NMR Search for the Spin Nematic State in a LaFeAsO Single Crystal
Abstract
We report a (75)As single crystal NMR investigation of LaFeAsO, the parent phase of a pnictide high T(c) superconductor. We demonstrate that spin dynamics develop a strong twofold anisotropy within each orthorhombic domain below the tetragonal-orthorhombic structural phase transition at T(TO) ≈ 156 K. This intermediate state with a dynamical breaking of the rotational symmetry freezes progressively into a spin density wave below T(SDW) ≈ 142 K. …
Authors
Fu M; Torchetti DA; Imai T; Ning FL; Yan J-Q; Sefat AS
Journal
Physical Review Letters, Vol. 109, No. 24,
Publisher
American Physical Society (APS)
Publication Date
December 14, 2012
DOI
10.1103/physrevlett.109.247001
ISSN
0031-9007