Spin dynamics in electron-doped iron pnictide superconductors
Yi Gao, Tao Zhou, C. S. Ting, Wu-Pei Su
DOI 10.1103/PhysRevB.82.104520 · Physical Review B
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Abstract
The doping dependence of spin excitations in Ba(Fe1−xCox)2As2 is studied based on a phenomenological two-orbital model under the random-phase approximation. We adopt this model because of its ability to fit the doping evolution of the Fermi surfaces and the asymmetry in the superconductivity (SC) coherent peaks as observed, respectively, by the angle-resolved photoemission spectroscopy (ARPES) and the scanning tunneling microscopy experiments in this type of compounds. The interplay between the spin-density wave and SC is considered in our calculation. Our results for the spin susceptibility are in qualitative agreement with neutron-scattering (NS) experiments in various doping ranges at temperatures above and below the superconducting transition temperature Tc. For the overdoped sample where one of the two hole pockets around Γ point disappears according to ARPES, we show that the imaginary part of the spin susceptibility in both SC and normal phases exhibits a gaplike behavior. This feature is consistent with the “pseudogap” as observed by recent nuclear magnetic resonance and NS experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba(FeAs1-xPx)2 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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