Superconducting and topological properties of CoX (X = As, Sb and Bi)

ORAL

Abstract

Recent studies have revealed high transition temperature (Tc) topological superconductivity in FeSe-based superconductors in either monolayer or bulk form. Here we use first-principles approaches to demonstrate that the systems of CoX (X = As, Sb, and Bi) are not only isovalent to FeSe, but also adopt the same layered structure, thereby may serve as new promising platforms to realize high-Tc superconductivity. Our detailed band structure analyses further show that these systems are topologically nontrivial, and can be exploited for materialization of topological superconductivity. Moreover, all these layered CoX structures can be stabilized on SrTiO3(001), which not only could enhance Tc, but also preserve the topological nature. These findings characterize CoX as appealing new systems to achieve high-Tc superconductivity and topological properties.

*Supported by NNSF of China and MOST.

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Presenters

  • Wenjun Ding

    • ICQD, University of Science and Technology of China

Authors

  • Jiaqing Gao

    • ICQD, University of Science and Technology of China

  • Shunhong Zhang

    • ICQD, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
    • ICQD, University of Science and Technology of China
    • International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of
    • University of Science and Technology of China
    • University of Science and Technology of China, Hefei 230026, China

  • Wenjun Ding

    • ICQD, University of Science and Technology of China

  • Ping Cui

    • ICQD, University of Science and Technology of China
    • University of Science and Technology of China, Hefei 230026, China

  • Zhenyu Zhang

    • University of Science and Technology of China, Hefei 230026, China
    • ICQD, University of Science and Technology of China
    • University of Science and Technology of China, Hefei, China