4.6 Article

Coexistence of ferromagnetism, antiferromagnetism, and superconductivity in magnetically anisotropic (Eu,La)FeAs2

Journal

NPJ QUANTUM MATERIALS
Volume 6, Issue 1, Pages -

Publisher

NATURE RESEARCH
DOI: 10.1038/s41535-021-00362-1

Keywords

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Funding

  1. National Natural Science Foundation of China [11904414, 11774402, 11704167]
  2. National Key Research and Development Program of China [2019YFA0705702]
  3. National Key Research Program of China [2018YFA0704200, 2016YFA0300301]
  4. Fundamental Research Funds for the Central Universities [2021qntd27]

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This study investigates the physical properties of the (Eu,La)FeAs2 system with double magnetic sublattices. La doping enhances magnetic anisotropy and reveals a special exchange bias in superposed ferromagnetic/superconducting loop. The coexistence of Eu-related ferromagnetism, Fe-related robust antiferromagnetism, and superconductivity is observed in Eu0.8La0.2FeAs2.
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 Fe-57 Mossbauer 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.

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