Nodal versus nodeless superconductivity in isoelectronic LiFeP and LiFeAs
R. Nourafkan
DOI 10.1103/PhysRevB.93.241116 · Physical Review B
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Abstract
Nodal superconductivity is observed in LiFeP while its counterpart LiFeAs with similar topology and orbital content of the Fermi surfaces is a nodeless superconductor. We explain this difference by solving, in the two-Fe Brillouin zone, the frequency-dependent Eliashberg equations with the spin-fluctuation-mediated pairing interaction. Because of Fermi surface topology details, in LiFeAs all the Fe−t2g orbitals favor a common pairing symmetry. By contrast, in LiFeP the dxy orbital favors a pairing symmetry different from dxz/yz and their competition determines the pairing symmetry and the strength of the superconducting instability: dxy orbital strongly overcomes the others and imposes the symmetry of the superconducting order parameter. The leading pairing channel is a dxy-type state with nodes on both hole and electron Fermi surfaces. As a consequence, the dxz/yz electrons weakly pair, leading to a reduced transition temperature in LiFeP.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiFeP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
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