Journal
PHYSICAL REVIEW B
Volume 80, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.094506
Keywords
arsenic alloys; band structure; barium alloys; carrier mobility; Fermi surface; nickel alloys; solid-state phase transformations; superconducting materials; superconducting transitions
Funding
- National Science Foundation of China
- Chinese Academy of Sciences
- Ministry of Science and Technology of China
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BaNi2As2 exhibits a first-order structural transition at 130 K. Understanding this structural transition is a crucial step toward 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 BaNi2As2 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.
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