NMR search for the spin nematic state in a LaFeAsO single crystal

NMR search for the spin nematic state in a LaFeAsO single crystal

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...

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Veröffentlicht in:Physical review letters 2012-12, Vol.109 (24), p.247001-247001, Article 247001
Hauptverfasser: Fu, M, Torchetti, D A, Imai, T, Ning, F L, Yan, J-Q, Sefat, A S
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container_end_page 247001
container_issue 24
container_start_page 247001
container_title Physical review letters
container_volume 109
creator Fu, M
Torchetti, D A
Imai, T
Ning, F L
Yan, J-Q
Sefat, A S
description 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. Our findings are consistent with the presence of a spin nematic state below T(TO) with an incipient magnetic order.
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title NMR search for the spin nematic state in a LaFeAsO single crystal
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