Co掺杂$_{x}$ Fe $_{2-y}$-Se $_{2}$单晶中的持续相分离和自旋玻璃
Sustained phase separation and spin glass in Co-doped K$_{x}$Fe$_{2-y}$Se$_{2}$ single crystals
摘要：
本文研究了KPDMATHABMM Fe $_{2-y-z}$ Co $_{z}$ Se $_{2}$（0.06 $\leq$ $z$ $\leq$ 1.73）单晶合金中Co的替代效应。通过3.5%的Co掺杂抑制了超导电性，而半导体K $_{2}$ Fe $_{4}$ Se $_{5}$和超导/金属K $_{x}$ Fe $_{2}$ Se $_{2}$的相分离仍然存在。结果表明，超导相（条纹相）的排列和分布与K、Fe和Co原子的排列有关。半导体自旋玻璃被发现在超导状态附近，持续大的Co浓度。在高Co浓度下，在自旋玻璃上方出现铁磁金属态。这与条形导电相的晶胞、排列和连通性的变化相一致。
英文摘要：
We present Co substitution effects in K$_{x}$Fe$_{2-y-z}$Co$_{z}$Se$_{2}$ (0.06 $\leq$ $z$ $\leq$ 1.73) single crystal alloys. By 3.5\% of Co doping superconductivity is suppressed whereas phase separation of semiconducting K$_{2}$Fe$_{4}$Se$_{5}$ and superconducting/metallic K$_{x}$Fe$_{2}$Se$_{2}$ is still present. We show that the arrangement and distribution of superconducting phase (stripe phase) is connected with the arrangement of K, Fe and Co atoms. Semiconducting spin glass is found in proximity to superconducting state, persisting for large Co concentrations. At high Co concentrations ferromagnetic metallic state emerges above the spin glass. This is coincident with changes of the unit cell, arrangement and connectivity of stripe conducting phase.
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