Coexistence of Ferromagnetism, Antiferromagnetism, and Superconductivity in Magnetically Anisotropic (Eu,la)feas2
npj quantum materials(2021)
摘要
Materials with exceptional magnetism and superconductivity usually conceive emergent physical phenomena. Here, we investigate the physical properties of the (Eu,La)FeAs 2 system with double magnetic sublattices. The parent EuFeAs 2 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 Eu 2+ realized in the overdoped region, and a special exchange bias of the superposed ferromagnetic/superconducting loop revealed in Eu 0.8 La 0.2 FeAs 2 . Meanwhile, the Fe-related antiferromagnetism shows unusual robustness against La doping. Theoretical calculation and 57 Fe Mössbauer 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 Eu 0.8 La 0.2 FeAs 2 , providing a platform for further exploration of potential applications and emergent physics. Finally, an electronic phase diagram is established for (Eu,La)FeAs 2 with the whole superconducting dome adjacent to the Fe-related antiferromagnetic phase, which is of benefit for seeking underlying clues to high-temperature superconductivity.
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关键词
Magnetic properties and materials,Superconducting properties and materials,Physics,general,Condensed Matter Physics,Structural Materials,Surfaces and Interfaces,Thin Films,Quantum Physics
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