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NMR Evidence for Universal Pseudogap Behavior in Quasi-Two-Dimensional FeSe-Based Superconductors

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【作者】康宝蕾；石孟竹；赵丹；李顺姣；李建；郑立玄；宋殿武；聂林鹏；吴涛；陈仙辉；

【Author】 B.L.Kang;M.Z.Shi;D.Zhao;S.J.Li;J.Li;L.X.Zheng;D.W.Song;L.P.Nie;T.Wu;X.H.Chen;Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China;Key Laboratory of Strongly coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China;CAS Center for Excellence in Superconducting Electronics (CENSE);Collaborative Innovation Center of Advanced Microstructures, Nanjing University;Hefei National Laboratory, University of Science and Technology of China;

【通讯作者】吴涛;陈仙辉;

【机构】 Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China； Key Laboratory of Strongly coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China； CAS Center for Excellence in Superconducting Electronics (CENSE)； Collaborative Innovation Center of Advanced Microstructures, Nanjing University； Hefei National Laboratory, University of Science and Technology of China；

【摘要】 Recently, by intercalating organic ions into bulk FeSe superconductors, two kinds of layered FeSe-based superconductors [（TBA）_xFeSe and （CTA）_xFeSe] with superconducting transition temperatures （T_c） above 40 K have been discovered. Due to the large interlayer distance（～15 ?）, these new layered superconductors have a large resistivity anisotropy analogous to bismuth-based cuprate superconductors. Moreover, remarkable pseudogap behavior well above T_c is revealed by nuclear magnetic resonance（NMR） measurements on ⁷⁷Se nuclei, suggesting a preformed pairing scenario similar to that of cuprates. Here, we report another new kind of organic-ion-intercalated FeSe superconductor,（PY）_xFeSe, with a reduced interlayer distance（～10 ?） compared to （TBA）_xFeSe and（CTA）_xFeSe. By performing ⁷⁷Se NMR and transport measurements, we observe a similar pseudogap behavior well above T_c of ～40 K and a large resistivity anisotropy of ～10⁴ in （PY）_xFeSe. All these facts strongly support a universal pseudogap behavior in these layered FeSe-based superconductors with quasi-two-dimensional electronic structures.更多还原

【Abstract】 Recently, by intercalating organic ions into bulk FeSe superconductors, two kinds of layered FeSe-based superconductors [（TBA）_xFeSe and （CTA）_xFeSe] with superconducting transition temperatures （T_c） above 40 K have been discovered. Due to the large interlayer distance（～15 ?）, these new layered superconductors have a large resistivity anisotropy analogous to bismuth-based cuprate superconductors. Moreover, remarkable pseudogap behavior well above T_c is revealed by nuclear magnetic resonance（NMR） measurements on ⁷⁷Se nuclei, suggesting a preformed pairing scenario similar to that of cuprates. Here, we report another new kind of organic-ion-intercalated FeSe superconductor,（PY）_xFeSe, with a reduced interlayer distance（～10 ?） compared to （TBA）_xFeSe and（CTA）_xFeSe. By performing ⁷⁷Se NMR and transport measurements, we observe a similar pseudogap behavior well above T_c of ～40 K and a large resistivity anisotropy of ～10⁴ in （PY）_xFeSe. All these facts strongly support a universal pseudogap behavior in these layered FeSe-based superconductors with quasi-two-dimensional electronic structures.更多还原

【关键词】 interlayer； layered； anisotropy； superconductor； pairing； nuclei； bismuth； analogous； facts； have；

【基金】 supported by the National Natural Science Foundation of China (Grant Nos. 11888101 and 12034004);the National Key R&D Program of China (Grant No. 2017YFA0303000);the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000);the Anhui Initiative in Quantum Information Technologies (Grant No. AHY160000);the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302800)

【文献出处】 Chinese Physics Letters ,中国物理快报(英文版) , 编辑部邮箱 ,2022年12期

【分类号】O469
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