Sr2VO3FeAs as compared to other iron-based superconductors
I. I. Mazin
DOI 10.1103/PhysRevB.81.020507 · Physical Review B
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Abstract
One of the most popular scenarios for the superconductivity in Fe-based superconductors (FeBSCs) posits that the bosons responsible for electronic pairing are spin fluctuations with a wave vector spanning the hole Fermi surfaces (FSs) near Γ and the electron FSs near M points. So far, all FeBSCs, for which neutron data are available, do demonstrate such excitations, and the band-structure calculations so far were finding quasinested FSs in all FeBSC, providing for a peak in the spin susceptibility at the desired wave vectors. However, one of the new additions to the family Sr2VO3FeAs has been calculated to have a very complex FS with no visible quasinesting features. It was argued therefore that this material does not fall under the existing paradigm and calls for revisiting our current ideas about what is the likely cause of superconductivity in FeBSC. In this Rapid Communication, I show that the visible complexity of the FS is entirely due to the V-derived electronic states. Assuming that superconductivity in Sr2VO3FeAs, as in the other FeBSC, originates in the FeAs layers, and the superconducting electrons are sensitive to the susceptibility of the FeAs electronic subsystem, I recalculate the bare susceptibility, weighting the electronic states with their Fe character, and obtain a susceptibility that fully supports the existing quasinesting model. Besides, I find that the mean-field magnetic ground state is the checkerboard in the V sublattice and stripes in the Fe sublattice.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2VO3FeAs 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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