Physics – Condensed Matter – Superconductivity
Scientific paper
2006-03-27
Phys. Rev. B 73, 224516 (2006)
Physics
Condensed Matter
Superconductivity
16 pages, 4 figures
Scientific paper
10.1103/PhysRevB.73.224516
We performed an extensive investigation on the correlations among superconductivity, structural instability and band filling in Nb1-xB2 materials. Structural measurements reveal that a notable phase transformation occurs at x=0.2, corresponding to the Fermi level (EF) in the pseudogap with the minimum total density of states (DOS) as demonstrated by the first-principles calculations. Superconductivity in Nb1-xB2 generally becomes visible in the Nb-deficient materials with x=0.2. Electron energy-loss spectroscopy (EELS) measurements on B K-edge directly demonstrated the presence of a chemical shift arising from the structural transformation. Our systematical experimental results in combination with theoretical analysis suggest that the emergence of hole states in the sigma-bands plays an important role for understanding the superconductivity and structural transition in Nb1-xB2.
Che Guang-Can
Li Jing-Qian
Li Qing-Kang
Ma Caiwen
Xiao R. J.
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