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Coexistence of superconductivity and antiferromagentic order in Er_(2)O_(2)Bi with anti-ThCr_(2)Si_(2) structure

Frontiers of physics 2021年第6期16卷 133-141页

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 Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621999China Department of Physics Hangzhou Normal UniversityHangzhou 310036China State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027China

We investigated the coexistence of superconductivity and antiferromagnetic order in the compound Er_(2)O_(2)Bi with anti-ThCr_(2)Si_(2)-type structure through resistivity,magnetization,specific heat measurements and first-principle *** 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 *** superconducting upper critical field H_(c2)(0)and electron-phonon coupling constantλe−ph in Er_(2)O_(2)Bi are similar to those in the previously reported non-magnetic superconductor Y_(2)O_(2)Bi with the same structure,indicating that the superconductivity in Er_(2)O_(2)Bi may have the same origin as in Y_(2)O_(2)*** first-principle calculations of Er_(2)O_(2)Bi 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 ***,upon increasing the oxygen incorporation in Er_(2)O_(x)Bi,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 *** 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.

关键词： superconductivity Kondo lattice magnetic correlation phase diagram

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