Electronic structure of BaNi$_2$As$_2$
Bo Zhou, Min Xu, Yan Zhang, Gang Xu, Cheng He, L. X. Yang, Fei Chen,, B. P. Xie, Xiao-Yu Cui, Masashi Arita, Kenya Shimada, Hirofumi Namatame,, Masaki Taniguchi, X. Dai, and D. L. Feng
TL;DR
This study investigates the electronic structure of BaNi$_2$As$_2$ using ARPES, revealing differences from iron pnictides and showing a lattice distortion-related hysteresis across its phase transition.
Contribution
It provides the first detailed ARPES analysis of BaNi$_2$As$_2$, highlighting its unique electronic features and the absence of magnetic ordering signatures.
Findings
Large electronlike bands around $ar{M}$ similar to calculations
No evidence of band folding or SDW magnetic order
Band shifts exhibit hysteresis related to lattice distortion
Abstract
BaNiAs, 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 and differences along -. We further show that the electronic structure of BaNiAs 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 BaNiAs.
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