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Since the discovery of superconductivity in MgB2 (Tc ~ 39 K), the search for superconductivity in related materials with similar structures or ingredients has never stopped. Although about 100 binary borides have been explored, only few of them show superconductivity with relatively low Tc. In this work, we report the discovery of superconductivity up to 32 K in MoB2 under pressure which is the highest Tc in transition-metal borides. Although the Tc can be well explained by theoretical calculations in the framework of electron-phonon coupling, the d-electrons and phonon modes of transition metal Mo atoms play utterly important roles in the emergence of superconductivity in MoB2, distinctly different from the case of well-known MgB2. Our study sheds light on the exploration of high-Tc superconductors in transition metal borides.
Key Words: (optional) high pressure, superconductivity, transition metal borides
References:
[1] C. Pei et al., National Science Review, 10, nwasd034 (2023)(arXiv:2105.13250 (2021).)
[2] C. Pei et al., Sci. China-Phys. Mech. Astron. 65, 287412 (2022).
[3] C. Pei et al., arXiv:2109.15213 (2021).
Yanpeng Qi got his Ph.D from Institute of Electrical Engineering, Chinese Academy of Sciences in 2011. From 2011 to 2014, he worked in Tokyo Institute of Technology as a Postdoctoral researcher collaboration with Prof. H. Hosono. From 2014 to 2017, he worked in the Max Plank Institute for Chemical Physics of Solids as a Humboldt fellow. In 2018, Yanpeng Qi joined the Shanghai Tech University as an assistant professor in School of Physical Science and Technology. His current research interests are physical properties under high pressure & Design and synthesis of new superconductors. He has co-authored 70+ peer-refereed papers including Nat. Commun.; PRL; Adv. Mater.; JACS etc.