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Soft x-ray spectroscopy experiments on the near K-edge of B in MB2 (M=Mg, Al, Ta, and Nb) | | J. Nakamura
; N. Yamada
; K. Kuroki
; T.A. Callcott
; D.L. Ederer
; J.D. Denlinger
; R.C.C. Perera
; | | Date: |
14 Aug 2001 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Soft X-ray absorption and emission measurements are performed for the K- edge of B in MB$_2$ (M=Mg, Al, Ta and Nb). Unique feature of MgB$_2$ with a high density of B 2$p_{xy}(sigma)$-state below and above the Fermi edge, which extends to 1 eV above the edge, is confirmed. In contrast, the B 2$p$ density of states in AlB$_2$ and TaB$_2$, both of occupied and unoccupied states, decreased linearly towards the Fermi energy and showed a dip at the Fermi energy. Furthermore, there is a broadening of the peaks with $psigma$-character in XES and XAS of AlB$_2$, which is due to the increase of three dimensionality in the $psigma$-band in AlB$_2$. The DOS of NbB$_2$ has a dip just below the Fermi energy. The present results indicate that the large DOS of B-2$psigma$ states near the Fermi energy are crucial for the superconductivity of MgB$_2$. | | Source: | arXiv, cond-mat/0108215 | | Services: | Forum | Review | PDF | Favorites | |
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