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- W2058989418 abstract "We have performed systematic high-resolution angle-resolved photoemission spectroscopy (ARPES) on two novel boride compounds, MgB 2 and CaB 6 , to study the electronic structure near the Fermi level relevant to the anomalous physical properties (superconductivity and ferromagnetism) observed in these compounds. In MgB 2 , we have succeeded in separately observing two superconducting gaps which originate in the a and π bands, respectively, and thereby established the two-band superconductivity. ARPES measurements on AlB 2 , which is a non-superconducting isostructural reference compound of MgB 2 with an additional electron in a unit cell, indicates the importance of the σ band for the superconductivity. In CaB 6 , we observed an energy gap of 1 eV at the X point in the Brillouin zone, which suggests that CaB 6 is intrinsically a large-gap semiconductor. This observation requires reconsideration of the excitonic-insulator model to explain the anomalous ferromagnetism in CaB 6 ." @default.
- W2058989418 created "2016-06-24" @default.
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- W2058989418 date "2007-08-20" @default.
- W2058989418 modified "2023-09-23" @default.
- W2058989418 title "Fermi surface of novel borides: MgB2and CaB6" @default.
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- W2058989418 doi "https://doi.org/10.1088/0953-8984/19/35/355003" @default.
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