Bulk band gaps in divalent hexaborides

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Complementary angle-resolved photoemission and bulk-sensitive k-resolved resonant inelastic x-ray scattering of divalent hexaborides reveal a >1 eV X-point gap between the valence and conduction bands, in contradiction to the band overlap assumed in several models of their novel ferromagnetism. This semiconducting gap implies that carriers detected in transport measurements arise from defects, and the measured location of the bulk Fermi level at the bottom of the conduction band implicates boron vacancies as the origin of the excess electrons. The measured band structure and X-point gap in CaB6 additionally provide a stringent test case for proper inclusion of many-body effects in ... continued below

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Denlinger, Jonathan; Clack, Jules A.; Allen, James W.; Gweon, Gey-Hong; Poirier, Derek M.; Olson, Cliff G. et al. August 1, 2002.

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Complementary angle-resolved photoemission and bulk-sensitive k-resolved resonant inelastic x-ray scattering of divalent hexaborides reveal a >1 eV X-point gap between the valence and conduction bands, in contradiction to the band overlap assumed in several models of their novel ferromagnetism. This semiconducting gap implies that carriers detected in transport measurements arise from defects, and the measured location of the bulk Fermi level at the bottom of the conduction band implicates boron vacancies as the origin of the excess electrons. The measured band structure and X-point gap in CaB6 additionally provide a stringent test case for proper inclusion of many-body effects in quasi-particle band calculations.

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  • Journal Name: Physical Review Letters; Journal Volume: 89; Journal Issue: 15; Other Information: Journal Publication Date: 10/07/2002

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  • Report No.: LBNL-51259
  • Grant Number: AC03-76SF00098
  • DOI: 10.1103/PhysRevLett.89.157601 | External Link
  • Office of Scientific & Technical Information Report Number: 826096
  • Grant Number: DMR-99-71611
  • Grant Number: DMR-00-84402
  • Archival Resource Key: ark:/67531/metadc783404

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  • August 1, 2002

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  • Dec. 3, 2015, 9:30 a.m.

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  • June 15, 2016, 1:14 p.m.

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Denlinger, Jonathan; Clack, Jules A.; Allen, James W.; Gweon, Gey-Hong; Poirier, Derek M.; Olson, Cliff G. et al. Bulk band gaps in divalent hexaborides, article, August 1, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc783404/: accessed August 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.