| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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$^{19}$F NMR Study of the Bilayer Iron-Based Superconductor KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$ |
| Yu-Ting Shao1,2, Wen-Shan Hong1,2, Shi-Liang Li1,2,3, Zheng Li1,2**, Jian-Lin Luo1,2,3** |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190
3Songshan Lake Materials Laboratory, Dongguan 523808
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| Cite this article: |
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Yu-Ting Shao, Wen-Shan Hong, Shi-Liang Li et al 2019 Chin. Phys. Lett. 36 127401 |
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Abstract We report a $^{19}\!$F nuclear magnetic resonance (NMR) study on single-crystal KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$ ($T_{\rm c} \sim 33.3$ K). The $^{19}$F NMR spectral shape of KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$ is weakly dependent on temperature and the Knight shift is small, which implies weak coupling between the CaF layer and the FeAs layer. The temperature dependence of 1/$^{19}\!T_{1}$ shows a hump below $T_{\rm c}$, however the 1/$^{75}\!T_{1}$ decreases just below $T_{\rm c}$, which implies that there are strong in-plane magnetic fluctuations in the CaF layers than in the FeAs layers. This may be caused by the motion of vortices. The absence of the coherence peak suggests unconventional superconductivity in KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$.
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Received: 22 October 2019
Published: 25 November 2019
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| PACS: |
74.70.Xa
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(Pnictides and chalcogenides)
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74.25.nj
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(Nuclear magnetic resonance)
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74.78.Fk
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(Multilayers, superlattices, heterostructures)
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| Fund: Supported by the National Key Research and Development Program of China under Grant No 2017YFA0302901, the National Basic Research Program of China under Grant No 2015CB921304, the National Science Foundation of China under Grant Nos 11674375 and 11634015, and the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences under Grant No XDB07020200. |
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