Angle-resolved photoemission study of novel boride compounds

Takashi Takahashi, Seigo Soma, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

Abstract

We have performed high-resolution photoemission spectroscopy on newly discovered novel boride compounds, MgB2, La-doped CaB6, and DVB2C2. In MgB2, we observed the superconducting gap of about 4.5 meV with s-wave symmetry. In La-doped CaB 6, we found a 1 eV energy gap at the X point in the Brillouin zone, in contrast with the LDA band calculation but in good agreement with the GW calculation. This requests reexamination of the excitonic-insulator model based on an overlap of an electron and a hole band at the X point. In DVB 2C2, we found two (one electron-like and one hole-like) Fermi surfaces, which are composed of the mixed states of the B2p, C2p and Dy5d orbitals, below the antiferro-quadrupolar-ordering temperature.

Original languageEnglish
Pages (from-to)5-10
Number of pages6
Journaljournal of the physical society of japan
Volume71
Issue numberSUPPL.
Publication statusPublished - 2002 Dec 1

Keywords

  • CaBe
  • DybB
  • Fermi surface
  • MgB
  • Photoemission spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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