Superconductivity tuned by the iron vacancy order in K$_{\bf x}$Fe$_{\bf 2-y}$Se$_2$

Combining in-depth neutron diffraction and systematic bulk studies, we discover that the $\sqrt{5} \times \sqrt{5}$ Fe vacancy order with its associated block antiferromagnetic order is the ground state, with varying occupancy ratio of the iron 16i and vacancy 4d sites, across the phase-diagram of K${\bf x} $F e$ {\bf 2-y} $S e$ _2$. The orthorhombic order with one of the four Fe sites vacant appears only at intermediate temperature as a competing phase. The material experiences an insulator to metal crossover when the $\sqrt{5} \times \sqrt{5}$ order has highly developed. Superconductivity occurs in such a metallic phase.

Superconductivity tuned by the iron vacancy order in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$

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Superconductivity tuned by the iron vacancy order in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$

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Superconductivity tuned by the iron vacancy order in Kxx​Fe2−y2−y​Se22​

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Superconductivity tuned by the iron vacancy order in Kxx​Fe2−y2−y​Se22​

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Superconductivity tuned by the iron vacancy order in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$

讲解博客

AI智能校验

Superconductivity tuned by the iron vacancy order in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$

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AI智能校验