Anisotropic spin fluctuations in detwinned FeSe
| Autor: | Chen, Tong, Chen, Youzhe, Kreisel, Andreas, Lu, Xingye, Schneidewind, Astrid, Qiu, Yiming, Park, J. T., Perring, Toby G., Stewart, J Ross, Cao, Huibo, Zhang, Rui, Li, Yu, Rong, Yan, Wei, Yuan, Andersen, Brian M., Hirschfeld, P. J., Broholm, Collin, Dai, Pengcheng |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Nature materials 18.7 (2019): 709 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41563-019-0369-5 |
| Popis: | 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 = 3.7 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. Comment: accepted for Nature Materials |
| Databáze: | arXiv |
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