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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 Cao1,4, Zhu-An Xu1,4( ) |
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 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 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 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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Keywords
superconductivity
Kondo lattice
magnetic correlation
phase diagram
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Corresponding Author(s):
Zhu-An Xu
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Issue Date: 15 July 2021
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