Synthesis of large FeSe superconductor crystals via ion release/introduction and property characterization

Yuan Dongna¹, Huang Yulong¹, Ni Shunli¹, Zhou Huaxue¹, Mao Yiyuan¹, Hu Wei¹, Yuan Jie¹, Jin Kui¹, Zhang Guangming³, Dong Xiaoli^{1, 2, †,}, Zhou Fang^{1, 2, ‡,}

Temperature dependence of the static magnetization around ∼ 55 K under the in-plane and out-of-plane fields for the typical FeSe crystal (T_c ∼ 7.6 K). (a) Below ∼ 55 K, the magnetization deviates from the linear behavior, leading to the downward curvature. This downward feature strongly depends on both the magnitude and direction of the applied magnetic field, as seen in panels (b) and (c), respectively. (d) The magnetization under the field (0.01 T) perpendicular to the ab plane.