NMR Search for the Spin Nematic State in LaFeAsO Single Crystal

M. Fu; D. A. Torchetti; T. Imai; F. L. Ning; J. -Q. Yan; A. S. Sefat

doi:10.1103/PhysRevLett.109.247001

NMR Search for the Spin Nematic State in LaFeAsO Single Crystal

Superconductivity 2015-11-09 v2 Strongly Correlated Electrons

Authors: M. Fu , D. A. Torchetti , T. Imai , F. L. Ning , J. -Q. Yan , A. S. Sefat

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Abstract

We report a 75-As single crystal NMR investigation of LaFeAsO, the parent phase of a pnictide high Tc superconductor. We demonstrate that spin dynamics develop a strong two-fold 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 (SDW) below T[SDW]~142 K. Our findings are consistent with the presence of a spin nematic state below T[TO] with an incipient magnetic order.

Keywords

spin nematic state NMR LaFeAsO spin density wave rotational symmetry breaking pnictide superconductors

Cite

@article{arxiv.1208.5652,
  title  = {NMR Search for the Spin Nematic State in LaFeAsO Single Crystal},
  author = {M. Fu and D. A. Torchetti and T. Imai and F. L. Ning and J. -Q. Yan and A. S. Sefat},
  journal= {arXiv preprint arXiv:1208.5652},
  year   = {2015}
}

Comments

Revised manuscript accepted for publication in Phys. Rev. Lett

NMR Search for the Spin Nematic State in LaFeAsO Single Crystal

Abstract

Keywords

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