Phase diagram and superconducting states in LaFeAsO1−xHx based on the multiorbital extended Hubbard model
Y. Yamakawa, S. Onari, H. Kontani, N. Fujiwara, S. Iimura, H. Hosono
DOI 10.1103/PhysRevB.88.041106 · Physical Review B
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Abstract
To understand the recently established unique magnetic and superconducting phase diagram of LaFeAsO1−xHx, we analyze the realistic multiorbital tight-binding model for x=0–0.4 beyond the rigid-band approximation. Both the spin and orbital susceptibilities are calculated in the presence of the Coulomb and charge quadrupole interactions. It is found that both orbital and spin fluctuations strongly develop at both x∼0 and 0.4, due to the strong violation of the rigid-band picture in LaFeAsO1−xHx. Based on this result, we discuss the experimental phase diagram, especially the double-dome superconducting phase. Moreover, we show that the quadrupole interaction is effectively produced by the vertex correction due to Coulomb interaction, resulting in the mutual development of spin and orbital fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xHx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| LaFeAsO1-xHx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | 3.7 GPa | unknown |
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