Significant contribution of As 4p orbitals to the low-lying electronic structure of the 112-type iron-based superconductor Ca0.9La0.1FeAs2
M. Y. Li, Z. T. Liu, W. Zhou, H. F. Yang, D. W. Shen, W. Li, J. Jiang, X. H. Niu, B. P. Xie, Y. Sun, C. C. Fan, Q. Yao, J. S. Liu, Z. X. Shi, X. M. Xie
DOI 10.1103/PhysRevB.91.045112 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report a systematic polarization-dependent angle-resolved photoemission spectroscopy study of the three-dimensional electronic structure of the recently discovered 112-type iron-based superconductor Ca1−xLaxFeAs2 (x=0.1). Besides the commonly reported three holelike and two electronlike bands in iron-based superconductors, we resolve one additional holelike band around the zone center and one more fast-dispersing band near the X point in the vicinity of the Fermi level. By tuning the polarization and the energy of incident photons, we are able to identify the specific orbital character and the kz dependence of all bands. Combining these results with band calculations, we find that As 4pz and 4px(4py) orbitals contribute significantly to the additional three-dimensional holelike band and the narrow band, respectively. Also, there is considerable hybridization between the As 4pz and Fe 3d orbitals in the additional holelike band, which suggests strong coupling between the unique arsenic zigzag bond layers and the FeAs layers therein. Our findings provide a comprehensive picture of the orbital character of the low-lying band structure of 112-type iron-based superconductors, which can be a starting point for the further understanding of their unconventional superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca0.9La0.1FeAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42.6 | Pressure not reported | onset |
| (Ca,La)FeAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | unknown |
Similar papers
Significant contribution of As 4p orbitals to the low-lying electronic structure of 112-type iron-based superconductor Ca0.9La0.1FeAs2
similarity 0.95M. Y. Li et al. · 2014 · arXiv:1411.5525
Source status unknown — claims are unverified
High-Tc Superconductivity near the Anion Height Instability in Fe-Based Superconductors: Analysis of LaFeAsO1−xHx
similarity 0.94Seiichiro Onari et al.
Source status unknown — claims are unverified
First-principles calculations of the effect of pressure on the iron-based superconductor LaFeAsO
similarity 0.93Hiroki Nakamura & Masahiko Machida
Source status unknown — claims are unverified
42214 layered Fe-based superconductors: An ab initio study of their structural, magnetic, and electronic properties
similarity 0.92F. Bucci et al.
Source status unknown — claims are unverified
Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO
similarity 0.92Yoichi Kamihara et al.
Source status unknown — claims are unverified
Prediction of double-Weyl points in the iron-based superconductor CaKFe4As4
similarity 0.92Niclas Heinsdorf et al.
Source status unknown — claims are unverified