期刊
CHEMISTRY OF MATERIALS
卷 32, 期 20, 页码 8781-8788出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c01807
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资金
- National Natural Science Foundation of China [11874264, 51772145]
- strategic Priority Research Program of Chinese Academy of Sciences [XDA18000000]
- Key Scientific Research Projects of Higher Institutions in Henan Province [19A140018]
- ShanghaiTech University
- Program for Professor of Special Appointment (Shanghai Eastern Scholar)
- Natural Science Foundation of Heilongjiang Province [A2017004]
- Analytical Instrumentation Center, SPST, ShanghaiTech University [SPST-AIC10112914]
Orthorhombic (space group: Pnma) Nb2P5 is a high-pressure phase that is quenchable to ambient pressure, which could be viewed as zigzag P8 chain-inserted NbP2. We report herein the high-pressure crystal growth of Nb2P5 and the discovery of its superconducting transition at Tc similar to 2.6 K. The electrical resistivity, magnetization, and specific heat capacity measurements on the high-quality crystal unveiled a conventional type-II weakly coupled s-wave nature of the superconductivity, with the upper critical field Hc2(0) similar to 0.5 T, the electron-phonon coupling strength.ep similar to 0.5-0.8, and the Ginzburg-Landau parameter. similar to 100. The ab initio calculations on the electronic band structure unveiled nodal-line structures protected by different symmetries. The one caused by band inversion, for example, on the G-X and U-R paths of the Brillouin zone, likely could bring nontrivial topology and hence a possible nontrivial surface state on the surface. The surface states on the (100), (010), and (110) surfaces were also calculated and discussed. The discovery of the phosphorus-rich Nb2P5 superconductor would be instructive for the design of more metal phosphide superconductors, which might host unconventional superconductivity or potential technical applications.
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