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

• 作者: 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
• 来源期刊: 物理学前沿
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: Condensed Matter&Materials Physics
• 页码范围: 130-138
• 页数: 9页
• 语种: 英文

摘要

We investigated the coexistence of superconductivity and antiferromagnetic order in the compound Er2O2Bi with anti-ThCr2Si2-type structure through resistivity,magnetization,specific heat measure-ments 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 constantλe-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 supercon-ductivity 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.