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
Dai P
中科院分区:
材料科学1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

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FeSe 的超导性源自向列相,该向列相打破了铁平面的四重旋转对称性。该相可能由轨道有序、自旋涨落或隐藏的磁四极有序产生。在这里,我们使用 FeSe 单晶镶嵌物上的非弹性中子散射,通过安装在 BaFe2As2 基板上来解孪生,以证明在正常状态下低能量 E= 6–11 meV 时,自旋激发在反铁磁波矢量 QAF= (±1, 0) 处最强烈。这种两倍(C2)各向异性在较低能量(3-5 meV)下会降低,表明有间隙的四倍(C4)模式。然而,在超导状态下,强向列各向异性再次反映在 QAF 处的自旋共振(E= 3.6 meV)中,并在 5-6 meV 附近出现不相称的散射。我们的结果突出了 FeSe 向列相的极端电子各向异性,并且与自旋涨落驱动的高度各向异性超导能隙一致。
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.
单轴应变 BaFe2-xNixAs2 四方态向列自旋相关性
DOI: 10.1126/science.1251853
发表时间: 2014-08-08
期刊: SCIENCE
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