Abstract
The recent discovery of superconductivity up to 32 K in the pressurized MoB2 reignites the interest in exploring high-Tc superconductors in transition-metal diborides. Inspired by that work, we turn our attention to the 5d transition-metal diborides. Here we systematically investigate the responses of both structural and physical properties of WB2 and ReB2 to external pressure, which possess different types of boron layers. Similar to MoB2, the pressure-induced superconductivity was also observed in WB2 above 60 GPa with a maximum Tc of 15 K at 100 GPa, while no superconductivity was detected in ReB2 in this pressure range. Interestingly, the structures at ambient pressure for both WB2 and ReB2 persist to high pressure without structural phase transitions. Theoretical calculations suggest that the ratio of flat boron layers in this class of transition-metal diborides may be crucial for the appearance of high Tc. The combined theoretical and experimental results highlight the effect of the geometry of boron layers on superconductivity and shed light on the exploration of novel high-Tc superconductors in borides.
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Funding
This work was supported by the National Key R&D Program of China (Grant Nos. 2018YFA0704300, 2018YFE0202600, and 2017YFA0302903), the National Natural Science Foundation of China (Grant Nos. U1932217, 11974246, 12004252, 12174443, and 11774424), the Natural Science Foundation of Shanghai (Grant No. 19ZR1477300), the Science and Technology Commission of Shanghai Municipality (Grant No. 19JC1413900), the Shanghai Science and Technology Plan (Grant No. 21DZ2260400), the Beijing Natural Science Foundation (Grant No. Z200005), and the Fundamental Research Funds for the Central Universities and Research Funds of Renmin University of China (RUC) (Grant Nos. 18XNLG14, 19XNLG13, 19XNLG17, and 22XNKJ40). The authors thank the support from Analytical Instrumentation Center (Grant No. SPSTAIC10112914), SPST, ShanghaiTech University. The authors thank the staffs from BL15U1 at Shanghai Synchrotron Radiation Facility for assistance during data collection. Computational resources were provided by the Physical Laboratory of High Performance Computing at Renmin University of China and Beijing Super Cloud Computing Center.
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Pei, C., Zhang, J., Gong, C. et al. Distinct superconducting behaviors of pressurized WB2 and ReB2 with different local B layers. Sci. China Phys. Mech. Astron. 65, 287412 (2022). https://doi.org/10.1007/s11433-022-1911-x
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DOI: https://doi.org/10.1007/s11433-022-1911-x