Electronic properties, low-energy Hamiltonian, and superconducting instabilities in CaKFe4As4
Felix Lochner, Felix Ahn, Tilmann Hickel, Ilya Eremin
DOI 10.1103/PhysRevB.96.094521 · 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 analyze the electronic properties of the recently discovered stoichiometric superconductor CaKFe4As4 by combining an ab initio approach and a projection of the band structure to a low-energy tight-binding Hamiltonian, based on the maximally localized Wannier orbitals of the 3d Fe states. We identify the key symmetries as well as differences and similarities in the electronic structure between CaKFe4As4 and the parent systems CaFe2As2 and KFe2As2. In particular, we find CaKFe4As4 to have a significantly more quasi-two-dimensional electronic structure than the latter systems. Finally, we study the superconducting instabilities in CaKFe4As4 by employing the leading angular harmonics approximation and find two potential A1g-symmetry representations of the superconducting gap to be the dominant instabilities in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaKFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.8 | Pressure not reported | unknown |
| Ba0.46K0.54Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | unknown |
Similar papers
Tuning superconductivity and spin-vortex instabilities in CaKFe4As4 through in-plane antisymmetric strains
similarity 0.96Adrian Valadkhani et al.
Source status unknown — claims are unverified
Electronic band structure and momentum dependence of the superconducting gap in Ca1−xNaxFe2As2 from angle-resolved photoemission spectroscopy
similarity 0.95D. V. Evtushinsky et al.
Source status unknown — claims are unverified
Bulk Fermi surface of the layered superconductor TaSe3 with three-dimensional strong topological state
similarity 0.94Wei Xia et al.
Source status unknown — claims are unverified
Band renormalization and Fermi surface reconstruction in iron-based superconductors
similarity 0.94Shun-Li Yu et al.
Source status unknown — claims are unverified
Low-temperature transport properties of doped Ba0.57K0.43Fe2As2 superconductors in high magnetic field
similarity 0.94Yueshen Wu et al.
Source status unknown — claims are unverified
First-principles study of the iron pnictide superconductor BaFe2As2
similarity 0.93E. Aktürk & S. Ciraci
Source status unknown — claims are unverified