Anisotropic spin fluctuations in detwinned FeSe.
Anisotropic spin fluctuations in detwinned FeSe.
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解孪生 FeSe 中的各向异性自旋涨落
DOI:
10.1038/s41563-019-0369-5
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发表时间:
2019-07
期刊:
影响因子:
41.2
通讯作者:
Dai P
中科院分区:
文献类型:
--
作者:
Chen T;Chen Y;Kreisel A;Lu X;Schneidewind A;Qiu Y;Park JT;Perring TG;Stewart JR;Cao H;Zhang R;Li Y;Rong Y;Wei Y;Andersen BM;Hirschfeld PJ;Broholm C;Dai P
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 BaFe2As2substrate to demonstrate that spin excitations are most intense at the antiferromagnetic wave vectors QAF= (±1, 0) at low energiesE= 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 QAFwith 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.
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影响因子:
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作者:
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