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ARPES study of X-point band overlaps in LaB6 and SmB6 — contrast to SrB6 and EuB6
Abstract
Angle resolved photoemission spectroscopy (ARPES) was used to study the complete absence of an X-point band gap for trivalent LaB6 and a partial absence of the band gap for mixed valent SmB6. A X-point band gap was found in divalent hexaborides. The two findings imply a nontrivial evolution of the band structure from divalent to trivalent hexaborides.
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