2014/09/13 by Ursula Pachmayr, Fabian Nitsche, H. Luetkens +8 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Critical field #Crystallography #Diamagnetism #Electrical resistivity and conductivity #Ferromagnetism #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic susceptibility #Magnetization #Materials science #Physics #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1002/anie.201407756
published as Angew. Chem. Int. Ed. 54 (2015) 293-297 · 13 pages, 7 Figures
arxiv created 2014/09/13 · openalex publication_date 2014/10/07 · arxiv updated 2014/12/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.