Angle-resolved photoemission spectroscopy of Cai1-xLa xB6

Seigo Souma, Takashi Takahashi, Yuji Umeda, Noriaki Kimura, Satoru Kunii, Haruyoshi Aoki

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1 Citation (Scopus)


We performed angle-resolved photoemission spectroscopy (ARPES) on Ca 1-xLaxb6 (x=0.01) to study the electronic structure and the origin of the anomalous high-temperature ferromag- netism. We found a large energy gap of about 1 eV at the Fermi level at the X point in the Brillouin zone in contrast to the LDA band calculation, which has predicted the semimetallic nature of CaB6 with a small overlap of an electron and a hole pocket at the X point. The band structure determined by ARPES shows a good agreement with the GW band calculation which predicts the semiconductive character. The present ARPES results request reexamination of the excitonic-insulator model based on a small overlap of two bands at the X point to explain the ferromagnetism in Ca1-xLaTLa TB6.

Original languageEnglish
Pages (from-to)317-319
Number of pages3
JournalJournal of the Physical Society of Japan
Issue numberSUPPL.
Publication statusPublished - 2002


  • Angle-resolved photoemission
  • Band structure
  • CaLaB
  • Excitonic insulator
  • Ferromagnetism


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