Observation of two superconducting domes under pressure in tetragonal FeS
Observation of two superconducting domes under pressure in tetragonal FeS
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DOI：
10.1038/s41535-017-0050-7
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发表时间：
2017-09
影响因子：
5.7
通讯作者：
Jun Zhang;Fengliang Liu;T. Ying;Nana Li;Yang Xu;Lanpo He;X. Hong;Yun-Jie Yu;Ming Wang
中科院分区：
文献类型：
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作者：
Jun Zhang;Fengliang Liu;T. Ying;Nana Li;Yang Xu;Lanpo He;X. Hong;Yun-Jie Yu;Ming Wang
我们研究了新超导体FeS(TC≈ 4.5 K)的超导电性和结构随压力的演化。在4.0GPa时，Tc迅速被抑制，超导电性消失，随后出现第二个超导穹顶，从5.0GpA到22.3GPa时，最大Tc值提高了30%。在7.0GPa四方相变到六方相的转变过程中，相共存的压力范围很宽。 GPa7。残余形变的四方相被认为是第二超导穹顶的来源。铁基超导体中两个超导穹顶的观测对理解它们的配对机制提出了巨大的挑战。
We investigate the evolution of superconductivity and structure with pressure for the new superconductor FeS (Tc≈ 4.5 K), a sulfide counterpart of FeSe. A rapid suppression ofTcand vanishing of superconductivity at 4.0 GPa are observed, followed by a second superconducting dome from 5.0 to 22.3 GPa with a 30% enhancement in maximumTc. An onsite tetragonal to hexagonal phase transition occurs around 7.0 GPa, followed by a broad pressure range of phase coexistence. The residual deformed tetragonal phase is considered as the source of second superconducting dome. The observation of two superconducting domes in iron-based superconductors poses great challenges for understanding their pairing mechanism.