Abstract
We investigated the coexistence of superconductivity and antiferromagnetic order in the compound Er2O2Bi with anti-ThCr2Si2-type structure through resistivity, magnetization, specific heat measurements and first-principle calculations. The superconducting transition temperature Tc of 1.23 K and antiferromagnetic transition temperature TN of 3 K are observed in the sample with the best nominal composition. The superconducting upper critical field Hc2(0) and electron-phonon coupling constant λe−ph in Er2O2Bi are similar to those in the previously reported non-magnetic superconductor Y2O2Bi with the same structure, indicating that the superconductivity in Er2O2 Bi may have the same origin as in Y2O2Bi. The first-principle calculations of Er2O2Bi show that the Fermi surface is mainly composed of the Bi 6p orbitals both in the paramagnetic and antiferromagnetic state, implying minor effect of the 4f electrons on the Fermi surface. Besides, upon increasing the oxygen incorporation in Er2OxBi, Tc increases from 1 to 1.23 K and TN decreases slightly from 3 K to 2.96 K, revealing that superconductivity and antiferromagnetic order may compete with each other. The Hall effect measurements indicate that hole-type carrier density indeed increases with increasing oxygen content, which may account for the variations of Tc and TN with different oxygen content.
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Acknowledgements
The authors would like to thank Yifeng Yang, and Jianhui Dai for insightful discussions. This work was supported by the National Key R&D Projects of China (Grant Nos. 2019YFA0308602 and 2016YFA0300402), the National Natural Science Foundation of China (Grant No. 11774305), and the Fundamental Research Funds for the Central Universities of China.
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Qiao, L., Wu, Nh., Li, T. et al. Coexistence of superconductivity and antiferromagentic order in Er2O2Bi with anti-ThCr2Si2 structure. Front. Phys. 16, 63501 (2021). https://doi.org/10.1007/s11467-021-1076-7
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DOI: https://doi.org/10.1007/s11467-021-1076-7