We report on the effects of 3.5 MeV proton irradiation on single crystals of the magnetic superconductor EuFe 2 (As 1 − x P x ) 2 , investigated at microwave frequencies by a coplanar waveguide resonator technique. We studied the relative strength of the two collective phenomena by analyzing the dependence of their onset temperatures on different perturbations: magnetic fields and structural disorder. Results suggest that superconductivity and magnetism in this material are two competing orders: as the former is suppressed by irradiation or by excess P doping, the latter reinforces and manifests itself at higher temperatures. The ability to modulate superconductivity and magnetism in EuFe 2 (As 1 − x P x ) 2 by disorder and in-plane magnetic field, respectively, offers the chance to tailor, even on a local scale, their relative weights. This could be useful for the aim of e...

中文翻译：

---

质子辐照对磁性超导体EuFe 2（As 1-x P x）2的影响

我们报告了3.5 MeV质子辐照对磁性超导体EuFe 2（As 1-x P x）2的单晶的影响，通过共平面波导谐振器技术在微波频率下进行了研究。我们通过分析两个集合现象的起始温度对不同扰动（磁场和结构紊乱）的依赖性来研究它们的相对强度。结果表明，这种材料的超导性和磁性是两个相互竞争的顺序：由于前者受到辐射或过量P掺杂的抑制，后者在高温下增强并表现出来。分别通过无序和平面内磁场调制EuFe 2（As 1-x P x）2中的超导性和磁性的能力提供了即使在局部范围内也可以调整其相对重量的机会。