Coexistence of superconductivity and antiferromagentic order in Er2O2Bi with anti-ThCr2Si2 structure

doi:10.1007/s11467-021-1076-7

Frontiers of Physics

2021, Vol. 16

Issue (6): 63501 https://doi.org/10.1007/s11467-021-1076-7

本期目录

Coexistence of superconductivity and antiferromagentic order in Er₂O₂Bi with anti-ThCr₂Si₂ structure

Lei Qiao¹, Ning-hua Wu¹, Tianhao Li¹, Siqi Wu¹, Zhuyi Zhang¹, Miaocong Li¹, Jiang Ma¹, Baijiang Lv², Yupeng Li¹, Chenchao Xu¹, Qian Tao¹, Chao Cao³, Guang-Han Cao^1,⁴, Zhu-An Xu^1,⁴(

)

¹. Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China
². Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, China
³. Department of Physics, Hangzhou Normal University, Hangzhou 310036, China
⁴. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China

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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 T_c 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 H_c2(0) and electron-phonon coupling constant λ_e₋_ph in Er₂O₂Bi are similar to those in the previously reported non-magnetic superconductor Y2O2Bi with the same structure, indicating that the superconductivity in Er₂O₂Bi 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 Er₂O_xBi, Tc increases from 1 to 1.23 K and T_N 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 T_c and T_N with different oxygen content.

Key words： superconductivity Kondo lattice magnetic correlation phase diagram

收稿日期: 2021-02-10 出版日期: 2021-07-15

Corresponding Author(s): Zhu-An Xu

引用本文:

. [J]. Frontiers of Physics, 2021, 16(6): 63501.
Lei Qiao, Ning-hua Wu, Tianhao Li, Siqi Wu, Zhuyi Zhang, Miaocong Li, Jiang Ma, Baijiang Lv, Yupeng Li, Chenchao Xu, Qian Tao, Chao Cao, Guang-Han Cao, Zhu-An Xu. Coexistence of superconductivity and antiferromagentic order in Er₂O₂Bi with anti-ThCr₂Si₂ structure. Front. Phys. , 2021, 16(6): 63501.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-021-1076-7
https://academic.hep.com.cn/fop/CN/Y2021/V16/I6/63501

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