Electronic structure of BaNi$_2$As$_2$

Details Electronic structure of BaNi$_2$As$_2$ Electronic structure of BaNi$_2$As$_2$

2010-10-10

arxiv.org/abs/1010.1905v2

Phys. Rev. B 83, 035110 (2011)

Physics

Condensed Matter

Superconductivity

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.83.035110

BaNi$_2$As$_2$, with a first order phase transition around 131 K, is studied by the angle-resolved photoemission spectroscopy. The measured electronic structure is compared to the local density approximation calculations, revealing similar large electronlike bands around $\bar{M}$ and differences along $\bar{\Gamma}$-$\bar{X}$. We further show that the electronic structure of BaNi$_2$As$_2$ is distinct from that of the sibling iron pnictides. Particularly, there is no signature of band folding, indicating no collinear SDW related magnetic ordering. Moreover, across the strong first order phase transition, the band shift exhibits a hysteresis, which is directly related to the significant lattice distortion in BaNi$_2$As$_2$.

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