Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field

Yang Lei-Lei¹, Liu Da-Yong^{1, †,}, Chen Dong-Meng², Zou Liang-Jian^{1, 3, ‡,}

Critical magnetic field of the spin-flop transition (H_c(Fe)) for Fe²⁺ ion depends on the interlayer coupling in EuFe₂As₂ with magnetic field H ∥ a.