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首页> 外文期刊>Npj Quantum Materials >Coexistence of ferromagnetism, antiferromagnetism, and superconductivity in magnetically anisotropic (Eu,La)FeAs2
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Coexistence of ferromagnetism, antiferromagnetism, and superconductivity in magnetically anisotropic (Eu,La)FeAs2

机译：磁性各向异性（EU，LA）FEAS2中的铁磁性，反铁磁体和超导体的共存

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摘要

Materials with exceptional magnetism and superconductivity usually conceive emergent physical phenomena. Here, we investigate the physical properties of the (Eu,La)FeAs2 system with double magnetic sublattices. The parent EuFeAs2 shows anisotropy-associated magnetic behaviors, such as Eu-related moment canting and exchange bias. Through La doping, the magnetic anisotropy is enhanced with ferromagnetism of Eu2+ realized in the overdoped region, and a special exchange bias of the superposed ferromagnetic/superconducting loop revealed in Eu0.8La0.2FeAs2. Meanwhile, the Fe-related antiferromagnetism shows unusual robustness against La doping. Theoretical calculation and 57Fe Mssbauer spectroscopy investigation reveal a doping-tunable dual itinerant/localized nature of the Fe-related antiferromagnetism. The coexistence of the Eu-related ferromagnetism, Fe-related robust antiferromagnetism, and superconductivity is further revealed in Eu0.8La0.2FeAs2, providing a platform for further exploration of potential applications and emergent physics. Finally, an electronic phase diagram is established for (Eu,La)FeAs2 with the whole superconducting dome adjacent to the Fe-related antiferromagnetic phase, which is of benefit for seeking underlying clues to high-temperature superconductivity.
机译：具有特殊磁性和超导性的材料通常设想出急流现象。在这里，我们研究了具有双磁子图示的（EU，LA）FEAS2系统的物理性质。父EUFEAS2显示各向异性相关的磁行为，例如与欧盟相关的力矩倾倒和交换偏置。通过La掺杂，磁各向异性通过ofopeAce中实现的EU2 +的铁磁性增强，并且在EU0.8LA0.2FEAS2中显示出叠加的铁磁性/超导环的特殊交换偏压。与此同时，Fe相关的反铁磁性对LA掺杂表现出不寻常的鲁棒性。理论计算和57Fe MSSBauer光谱研究揭示了Fe相关反铁磁性的掺杂可调性的双潮/局部性质。在EU0.8LA0.2FEAS2中进一步揭示了与欧盟相关的铁磁性，FE相关的铁磁性和超导性的共存，为进一步探索潜在应用和紧急物理学提供平台。最后，将电子相图（Eu，La）feas2建立，与Fe相关的反铁磁相的整个超导圆顶建立，这是有益于寻求底层线索到高温超导性的益处。

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