Universal quasidegenerate orbital origin of two-dome phases in iron pnictide superconductors
Da-Yong Liu, Zhe Sun, Feng Lu, Wei-Hua Wang, Liang-Jian Zou
DOI 10.1103/cdgy-gwyj · Physical Review B
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Abstract
A series of experiments revealed that novel bipartite magnetic and superconducting (SC) phases widely exist in the phase diagrams of iron pnictides and chalcogenides. Nevertheless, the origin of the two-dome magnetic and SC phases in iron-based compounds remains unclear. Here we theoretically investigated the electronic structures, magnetic, and SC properties of three representative iron-based systems, i.e., LaFeAsO1−xHx, LaFeAs1−xPxO, and KFe2As2. We propose a unified quasidegenerate orbital mechanism for the emergence of the two-dome parent magnetic/structural phase and the subsequent two-dome SC phase. It is found that the degenerate in-plane anisotropic dxz/yz orbitals dominate the first magnetic/structural and SC phases, while in-plane isotropic orbitals dxy or d3z2−r2 with quasidegeneracy originating from quasisymmetry drive the emergence of the second magnetic/SC dome phase. Moreover, a matching rule of spin and orbital modes for SC pairing state is proposed in multiorbital iron-based systems. These results imply an orbital-driven mechanism as well as an orbital-selective scenario and shed light on the understanding of the multidome magnetic and SC phases in multiorbital systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO1-xHx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAs1-xPxO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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