Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (Haus D), 81377 München (Germany).
Angew Chem Int Ed Engl. 2015 Jan 2;54(1):293-7. doi: 10.1002/anie.201407756. Epub 2014 Oct 7.
Superconducting [(Li1-x Fex )OH](Fe1-y Liy )Se (x≈0.2, y≈0.08) was synthesized by hydrothermal methods and characterized by single-crystal and powder X-ray diffraction. The structure contains alternating layers of anti-PbO type (Fe1-y Liy )Se and (Li1-x Fex )OH. Electrical resistivity and magnetic susceptibility measurements reveal superconductivity at 43 K. An anomaly in the diamagnetic shielding indicates ferromagnetic ordering near 10 K while superconductivity is retained. The ferromagnetism is from the iron atoms in the (Li1-x Fex )OH layer. Isothermal magnetization measurements confirm the superposition of ferromagnetic and superconducting hysteresis. The internal ferromagnetic field is larger than the lower, but smaller than the upper critical field of the superconductor. The formation of a spontaneous vortex phase where both orders coexist is supported by (57) Fe-Mössbauer spectra, (7) Li-NMR spectra, and μSR experiments.
通过水热法合成了超导 [(Li1-x Fex )OH](Fe1-y Liy )Se（x≈0.2，y≈0.08），并用单晶和粉末 X 射线衍射对其进行了表征。该结构包含反 PbO 型 (Fe1-y Liy )Se 和 (Li1-x Fex )OH 交替层。电阻率和磁化率测量表明在 43 K 时存在超导性。在 10 K 附近的抗磁屏蔽异常表明存在铁磁有序，而超导性得以保留。铁磁性来自 (Li1-x Fex )OH 层中的铁原子。等温磁化测量证实了铁磁和超导滞后的叠加。内铁磁场大于下临界场，但小于上临界场。(57)Fe-Mössbauer 谱、(7)Li-NMR 谱和 μSR 实验支持了共存两种有序的自发涡旋相的形成。
