TY  - JOUR
AU  - Chen, Tong
AU  - Chen, Youzhe
AU  - Kreisel, Andreas
AU  - Lu, Xingye
AU  - Schneidewind, Astrid
AU  - Qiu, Yiming
AU  - Park, J. T.
AU  - Perring, Toby G.
AU  - Stewart, J Ross
AU  - Cao, Huibo
AU  - Zhang, Rui
AU  - Li, Yu
AU  - Rong, Yan
AU  - Wei, Yuan
AU  - Andersen, Brian M.
AU  - Hirschfeld, P. J.
AU  - Broholm, Collin
AU  - Dai, Pengcheng
TI  - Anisotropic spin fluctuations in detwinned FeSe
JO  - Nature materials
VL  - 18
IS  - 7
SN  - 1476-4660
CY  - Basingstoke
PB  - Nature Publishing Group
M1  - FZJ-2019-06642
SP  - 709 - 716
PY  - 2019
AB  - Superconductivity in FeSe emerges from a nematic phase that breaks four-fold rotational symmetry in the iron plane. This phase may arise from orbital ordering, spin fluctuations or hidden magnetic quadrupolar order. Here we use inelastic neutron scattering on a mosaic of single crystals of FeSe, detwinned by mounting on a BaFe2As2 substrate to demonstrate that spin excitations are most intense at the antiferromagnetic wave vectors QAF = (±1, 0) at low energies E = 6–11 meV in the normal state. This two-fold (C2) anisotropy is reduced at lower energies, 3–5 meV, indicating a gapped four-fold (C4) mode. In the superconducting state, however, the strong nematic anisotropy is again reflected in the spin resonance (E = 3.6 meV) at QAF with incommensurate scattering around 5–6 meV. Our results highlight the extreme electronic anisotropy of the nematic phase of FeSe and are consistent with a highly anisotropic superconducting gap driven by spin fluctuations.
LB  - PUB:(DE-HGF)16
C6  - pmid:31110345
UR  - <Go to ISI:>//WOS:000472020800016
DO  - DOI:10.1038/s41563-019-0369-5
UR  - https://juser.fz-juelich.de/record/868049
ER  -