ARPES Study of X-Point Band Overlaps in LaB$_6$ and SmB$_6$ - Contrast to SrB$_6$ and EuB$_6$
arXiv:cond-mat/0107203 · doi:10.1016/S0921-4526(01)01291-1
Abstract
In contrast to our recent finding of an X-point band gap in divalent hexaborides, we report here that angle resolved photoemission spectroscopy (ARPES) data shows that the gap is absent for trivalent LaB$_6$ and is absent or nearly so for mixed valent SmB$_6$. This finding demonstrates a nontrivial evolution of the band structure from divalent to trivalent hexaborides.
submitted to SCES '01