Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-06
Phys. Rev. B 80, 094506 (2009) (slightly modified version)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, better resolution for figure 4
Scientific paper
BaNi$_2$As$_2$ exhibits a first order structural transition at 130 K. Understanding this structural transition is a crucial step towards understanding the electronic properties of the material. We present a combined optical spectroscopy and band structure calculation study on the compound across the transition. The study reveals that BaNi$_2$As$_2$ is a good metal with a rather high plasma frequency. The phase transition leads to a small reduction of conducting carriers. We identify that this reduction is caused by the removal of several small Fermi surface sheets contributed dominantly from the As-As bonding and Ni-As antibonding states.
Chen Guo-Feng
Chen Zheng-Gen
Fang Zhong
Hu W.-Z.
Luo Jian-Lin
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