title: Superconductivity and ferromagnetism in EuFe₂(As(1-x)P(x))₂.
abstract: Superconductivity and ferromagnetism are two antagonistic cooperative phenomena, which makes it difficult for them to coexist. Here we demonstrate experimentally that they do coexist in EuFe₂(As(1-x)P(x))₂ with 0.2 ≤ x ≤ 0.4, in which superconductivity is associated with Fe 3d electrons and ferromagnetism comes from the long-range ordering of Eu 4f moments via Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions. The coexistence features large saturated ferromagnetic moments, high and comparable superconducting and magnetic transition temperatures, and broad coexistence ranges in temperature and field. We ascribe this unusual phenomenon to the robustness of superconductivity as well as the multi-orbital character of iron pnictides.
authors: State Key Lab of Silicon Materials and Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China. ghcao@zju.edu.cn
authors: Guanghan
authors: G
authors: Cao
authors: Shenggao
authors: S
authors: Xu
authors: Zhi
authors: Z
authors: Ren
authors: Shuai
authors: S
authors: Jiang
authors: Chunmu
authors: C
authors: Feng
authors: Zhu'an
authors: Z
authors: Xu