Possible way to turn MgFeGe into an iron-based superconductor
Ming-Cui Ding, Yu-Zhong Zhang
DOI 10.1103/PhysRevB.89.085120 · Physical Review B
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Abstract
We propose that the contrasting low-temperature behaviors observed experimentally among isostructural and isoelectronic materials, like nonsuperconducting and nonmagnetic MgFeGe, magnetically ordered NaFeAs, and superconducting LiFeAs, can be well understood from itinerant weak-coupling limit. We find that stronger (π,π) instability appearing in the dx2−y2 orbital of NaFeAs is responsible for the occurrence of weak magnetism, while weaker but still prominent (π,π) instability in LiFeAs leads to a superconducting state. In contrast, multiple competing instabilities coexisting in orbital-resolved momentum-dependent susceptibilities, serving as magnetic frustrations from itinerant electrons, may account for the nonmagnetic state in MgFeGe, while poorer Fermi surface nesting leads to a nonsuperconducting state. Based on above findings, we predict a possible way to make MgFeGe a new Fe-based superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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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