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- W1950423702 abstract "We investigate the quasiparticle interference (QPI) in Fe-based superconductors in both the $s_{++}$-wave and $s_{pm}$-wave superconducting states on the basis of the five-orbital model. In the octet model for cuprate superconductors with $d_{x^2 - y^2}$-wave state, the QPI signal due to the impurity scattering at ${q} = {k}_i - {k}_j$ ($E = | Delta ( {k}_i ) |$, $i = 1 sim 8$) disappears when the gap functions at ${k}_i$ and ${k}_j$ have the same sign. However, we show that this extinction rule does not hold in Fe-based superconductors with fully-gapped $s$-wave state. The reason is that the resonance condition $E = | Delta ( {k}_i ) |$ is not satisfied under the experimental condition for Fe-based superconductors. We perform the detailed numerical study of the QPI signal using the $T$-matrix approximation, and show that the experimentally observed QPI peak around ${q}_2 = ( pi, 0 )$ can be explained on the basis of both the $s_{++}$-wave and $s_{pm}$-wave states. Furthermore, we discuss the magnetic field dependence of the QPI by considering the Zeeman effect, and find that the field-induced suppression of the peak intensity around ${q}_2$ can also be explained in terms of both the $s_{++}$-wave and $s_{pm}$-wave states." @default.
- W1950423702 created "2016-06-24" @default.
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- W1950423702 date "2015-07-27" @default.
- W1950423702 modified "2023-10-18" @default.
- W1950423702 title "Quasiparticle interference in Fe-based superconductors based on a five-orbital tight-binding model" @default.
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- W1950423702 doi "https://doi.org/10.1103/physrevb.92.045124" @default.
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