Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe
Daniel Guterding, Harald O. Jeschke, P. J. Hirschfeld, Roser Valentí
DOI 10.1103/PhysRevB.91.041112 · 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
In the recently synthesized Lix(NH2)y(NH3)zFe2Se2 family of iron chalcogenides, a molecular spacer consisting of lithium ions, lithium amide, and ammonia separates the layers of FeSe. It has been shown that upon variation of the chemical composition of the spacer layer, superconducting transition temperatures can reach Tc∼44K, but the relative importance of the layer separation and effective doping to the Tc enhancement is currently unclear. Using state of the art band structure unfolding techniques, we construct eight-orbital models from ab initio density functional theory calculations for these materials. Within an RPA spin-fluctuation approach, we show that the electron doping enhances the superconducting pairing, which is of s± symmetry and explain the experimentally observed limit to Tc in the molecular spacer intercalated FeSe class of materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li0.56(NH2)0.53(NH3)1.19Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| Li0.6(NH2)0.2(NH3)0.8Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
Similar papers
Elucidating the magnetic and superconducting phases in the alkali metal intercalated iron chalcogenides
similarity 0.97Meng Wang et al.
Source status unknown — claims are unverified
Visualization of atomic-scale phenomena in superconductors: Application to FeSe
similarity 0.96Peayush Choubey et al.
Source status unknown — claims are unverified
Robustness of superconducting properties to transition metal substitution and impurity phases in Fe1−xVxSe
similarity 0.96Franziska K. K. Kirschner et al.
Source status unknown — claims are unverified
Doping dependence of the spin excitations in the Fe-based superconductors Fe1+yTe1−xSex
similarity 0.96A. D. Christianson et al.
Source status unknown — claims are unverified
Bulk Superconductivity and Role of Fluctuations in the Iron-Based Superconductor FeSe at High Pressures
similarity 0.96Elena Gati et al.
Source status unknown — claims are unverified
Pressure dependence of the electronic structure and spin state in Fe1.01Se superconductors probed by x-ray absorption and x-ray emission spectroscopy
similarity 0.96J. M. Chen et al.
Source status unknown — claims are unverified