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NMR Search for the Spin Nematic State in LaFeAsO Single Crystal

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.

preprint2012arXivOpen access
M. FuD. A. TorchettiT. ImaiF. L. NingJ. -Q. YanA. S. Sefat
cond-mat.supr-concond-mat.str-el
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Open access6 authors2 topics
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M. FuD. A. TorchettiT. ImaiF. L. NingJ. -Q. YanA. S. Sefat

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