Electronic Structure of B-2p State in AlB2 Single Crystal: Direct Observation of pσ and pπ Density of States

Jin Nakamura, Masamitsu Watanabe, Tamio Oguchi, Sin Ya Nasubida, Eiki Kabasawa, Nobuyoshi Yamada, Kazuhiko Kuroki, Hisashi Yamazaki, Shik Shin, Yuji Umeda, Shin Minakawa, Noriaki Kimura, Haruyoshi Aoki

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16 Citations (Scopus)

Abstract

X-ray emission (XES) and absorption (XAS) spectra near the B-K edge were measured on single-crystalline AlB2 compound which is an isostructural diboride of superconducting MgB2. The partial density of states (PDOS) of B-2pσ and pπ orbitals were derived from the polarization dependence of XES and XAS spectra. There are considerable amounts of PDOS near the Fermi energy in AlB2 similarly to that in MgB 2, but there are almost no PDOS in pσ orbitals of AlB 2 near the Fermi energy, i.e., a pseudo-gap in pσ state and a broad metallic state in pπ state are observed. The present result indirectly supports scenarios that the pσ holes play an important role in the occurrence of superconductivity in MgB2. The overall features of PDOS were found to be in good agreement with the result of band calculation of AlB2, but a small discrepancy in the Fermi energy is observed, which is attributed to the Al vacancy in the compounds, i.e., the estimated concentration is Al0.93B2.

Original languageEnglish
Pages (from-to)408-410
Number of pages3
Journaljournal of the physical society of japan
Volume71
Issue number2
DOIs
Publication statusPublished - 2002 Feb

Keywords

  • AlB2
  • MgB2
  • Partial density of state
  • Pσ and pπ orbitals
  • Single crystal
  • X-ray emission and absorption spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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